Question: On which day of the week did Hitesh visit the zoo? Statements: I.…

Concept:

In a data-sufficiency question, a statement is sufficient on its own only when it narrows the possibilities down to exactly one value; if several values still fit after using it, that statement alone is insufficient. Each statement must be checked independently first, before checking them together.

Applying it here:

• Statement I only rules out Tuesday and Thursday, leaving five other days of the week still possible — it does not settle on a single day by itself, so it is not sufficient alone.

• Statement II gives two relative clues that combine into one exact day: the day after Monday is Tuesday, so that is when Hitesh's mother arrived; two days before Tuesday is Sunday, so Statement II alone fixes the visit as a single specific day.

Cross-check:

Sunday does not fall on Tuesday or Thursday, so it is consistent with Statement I as well — confirming Statement II's result holds on its own, and that Statement I's information alone was never enough to reach it.

Why the other choices don't fit:

• Claiming Statement I alone is enough (with Statement II not) reverses the actual situation — Statement I still leaves multiple candidate days, while Statement II's chain of clues reaches one day by itself.

• Calling it 'either statement alone works' requires both to independently fix a single day; Statement I never narrows down to one day, so that requirement fails.

• Concluding 'neither is sufficient' misses that one of the two clues (the relative-day chain) already pins down one exact day on its own.