Of all the photographs taken of him at his wedding there was one that

Sure D on this one. One can never see one's own face except in a mirror. And thats why John thinks that this picture resembles him since he is used to seeing himself only in a mirror. All his friends see him face-to-face regularly, so they must be seeing some subtle differences, which John is not seeing.

D seems to be the answer. John's friends see him often in good or bad light (so flash wouldn't matter) but they never see him in a mirror. John is the only one who sees himself in a mirror. So, he would be familiar with what he looks like but only with the aid of a mirror. His friends on the other hand would not know that. In other words, John perceives himself differently from how his friends perceive him. Why? Because of the mirror.

Its clear D , resolve the paradox require both the strengthening and weakening of the argument

(A) It, unlike the other photographs of John, showed him in the style of dress he and his friends usually wear rather than the formal clothes he wore at the ceremony. (Actually contradicts , cause he is wearing style which he and his friends usually wear , so if anything this should help his friends.)
(B) It was the only photograph taken of John at his wedding for which the photographer had used a flash. Out of scope if only flash should help in the night which should help to have the same consent both from him and his friends
(C) It was a black-and-white photograph, whereas the other photographs that showed John were mostly color photographs. Out of scope
(D) It was unique in showing John’s face reflected in a mirror, the photographer having taken the photograph over John’s shoulder. Correct, John would be able to identify himself cause he is used to seeing himself that ways , his friends wont ,

by the way this is wrong if you go by physics you cant capture virtual images , but its a GMAT exam not a Physics olympiad

(E) It was one of only a few taken at the wedding that showed no one but John. Out of scope

Spent 3 minutes only to choose A, however, without any confidence.

I believe similar logic is tested in this one also.
https://gmatclub.com/forum/the-figures- ... ml#p845256

In both the question, the way the passage is constructed, it was about protagonist's view/point at the centre of the argument(crux) that makes things confusing.

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