Question : How is the girl in the photograph related to Kunal? Statements:…

In a data-sufficiency blood-relation problem, a statement (or a combination of statements) is 'sufficient' only when it pins down one single relationship with no other reading possible; if a statement leaves more than one family arrangement possible, it is not sufficient on its own and must be combined with another statement that removes the ambiguity.

1. Statement I alone: it identifies the girl as the mother of a child who is the father's only granddaughter, but without knowing whose child that is, the girl could be Kunal's wife or a sibling's wife — so Statement I alone leaves more than one relationship possible.

2. Statement II alone: it only rules out siblings for Kunal; on its own it says nothing about who the girl is, so it cannot fix the relationship by itself.

3. Statement III alone: this is Kunal's own account of his family — "she is the only daughter-in-law of my mother" — describing her directly through his relationship to his mother, with no other son introduced anywhere in the statement. Taken on its own terms, this identifies her as the wife of that one son, i.e. Kunal himself, so Statement III alone pins down a single relationship.

4. Statements I and II together: once Statement II confirms Kunal has no siblings, the 'father's only granddaughter' from Statement I can only be Kunal's own daughter, which removes the ambiguity in Statement I and fixes the same single relationship.

So the relationship is fixed in two independent ways — by Statement III on its own, and separately by Statements I and II together — while Statement II by itself settles nothing, and combining II with III adds no new information beyond what Statement III already establishes on its own. That 'either one statement alone, or one specific pair' pattern is exactly what the correct option describes.