Explanation
Correct answer: B.
Choice B is the best answer. "Defied" means "resisted" or "deliberately disobeyed," which matches the way Klein broke from the conventions of photography in his time by including features that were generally seen as flaws.
Why the other choices are wrong
Choice A
Choice A is incorrect. "Reviewed" means "analyzed" or "evaluated," but that doesn’t really fit the context here. Klein isn’t directly providing any thoughtful examination of the conventions of photography: he’s just breaking all the rules.
Choice C
Choice C is incorrect. "Respected" can mean "admired" or "followed" (as in the case of conventions). It’s clear that Klein didn’t respect conventions, given his use of photographic features that were generally considered "flaws."
Choice D
Choice D is incorrect. "Prevented" means "stopped," and Klein did not stop the conventions—they still existed. Instead, he made images that were seen as "flawed" under those conventions.