Explanation
Correct answer: A.
Choice A is the best answer. The convention being tested is subject-modifier placement. This choice makes the noun phrase “many critics” the subject of the sentence and places it immediately after the modifying phrase “in assessing…Kurosawa.” In doing so, this choice clearly establishes that it is the critics—and not another noun in the sentence—who assess Kurosawa’s films.
Why the other choices are wrong
Choice B
Choice B is incorrect because it results in a dangling modifier. The placement of the noun phrase “Kurosawa’s…sources” immediately after the modifying phrase illogically suggests that his use of Western literary sources is what assesses Kurosawa’s films.
Choice C
Choice C is incorrect because it results in a dangling modifier. The placement of the function word “there” immediately after the modifying phrase illogically suggests that “there” is what assesses Kurosawa’s films.
Choice D
Choice D is incorrect because it results in a dangling modifier. The placement of the noun phrase “the focus…critics” immediately after the modifying phrase illogically suggests that the critics’ focus is what assesses Kurosawa’s films.