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Can someone explain why choice B is correct and not D?

I already looked at the Manhattan response and I sort of get it. Normally with assumption questions the "new" term in the conclusion (we'll call it term 4) would link together with a premise (we'll call it term 3) in an answer choice like "4-->3" (choice D) not "3-->4" (choice B). What is the reason this question is atypical? Is there a certain nuance I'm missing?

Any help would be appreciated. Thanks.

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Ok I missed the gap & emphasis on photographs. I completely get it now. Thanks for the help! You're response was incredibly helpful