In the following question, statements 1 and 6 are respectively the first and…

A ‘first-and-last-sentence-fixed’ para-jumble is solved by treating the two given sentences (here, statement 1 and statement 6) as fixed anchors and testing every candidate order for unbroken links: each pronoun or demonstrative (‘this’, ‘such’) must resolve to the immediately preceding idea, and each discourse connector (‘Adding to this’) must introduce a genuinely new, parallel point — never a repeat or an unrelated jump. The correct order is the only one where every adjacent pair satisfies this test all the way from the opening sentence to the closing sentence.

1. Statement 1 opens the paragraph: without a minimum of endurance, strength and flexibility, ordinary day-to-day functioning suffers — most people don't realize this.

2. D follows 1 directly: ‘When we give in to the comforts of modern day living and inadvertently let our bodies deteriorate, our abilities to carry out physical activities are so adversely affected…’ continues the same idea — what happens when that minimum fitness is NOT maintained.

3. C follows D: ‘The realization of this dawns only when the necessity occurs’ — ‘this’ refers to the adverse effect on physical ability that D has just described.

4. B follows C: ‘Our current ways of life in general, are no longer providing our bodies with sufficient exercise’ supplies the everyday, structural reason behind the deterioration and late realization just described.

5. A follows B: ‘Adding to this’ explicitly signals a second, parallel modern-day problem being layered onto B's point about insufficient exercise — the 21st century's unforeseen emergencies (9/11, epidemics, terrorism).

6. Statement 6 follows A: ‘In such circumstances’ picks up exactly the unpredictable, emergency-type circumstances A has just listed, and concludes that pursuing physical fitness is ultimately a matter of personal choice.

Statement 6 opens with ‘In such circumstances’ — a phrase that needs a concrete set of circumstances to point back to. Only A supplies one (naming the 9/11 attack, epidemic outbreaks, and terrorism); no other statement describes an actual ‘circumstance’ in that sense, which independently confirms that A must be the sentence immediately before statement 6.

• Ending the paragraph one sentence early on D (as in the order A-B-C-D) leaves ‘in such circumstances’ pointing at a statement about physical ability being affected, not at any named event or circumstance — the closing link fails.

• Opening with A directly after statement 1 (as in A-B-C-D) forces ‘Adding to this’ to add onto the fitness/day-to-day-functions idea of statement 1 itself, but 1 names no prior risk or problem for A's emergencies to add to — the very first link fails.

• Moving D to follow A (as in B-A-D-C) jumps from a discussion of societal-scale emergencies straight into personal comfort-seeking and bodily decline with no connecting word or idea bridging the two — an unexplained topic change.

• Placing C directly after A (as in D-A-C-B) leaves ‘the realization of this’ without a clear antecedent, since ‘this’ fits the bodily deterioration described in D far better than it fits A's unforeseen emergencies — the demonstrative loses its referent.

Only the order D-C-B-A keeps every link intact from statement 1 through to statement 6, so ‘DCBA’ is the correct rearrangement.