OFFICIAL EXPLANATION
C
The reasons Brod is described as a controversial figure are a major focus of this passage, so researching this question should give you little trouble. The correct answer comes from the sentence in which the author tells you what "many in the field" feel about Brod: he was incapable of appreciating Kafka's work despite being its sole caretaker. Choice (A), while saying nothing that directly contradicts the passage, is not supported by the passage, either. No mention is made of Kafka's feelings towards Brod's editing. That's the first choice you can eliminate. Choices (B) and (D) both possess language not contained in the passage. The passage does not discuss Kafka's and Brod's upbringings or Kafka being "repulsed" by Brod's lifestyle. Choice (E) sounds reminiscent of the passage, but the passage describes Kafka's wish to have his writing burned, a wish Brod denies. Choice (E) misstates this situation and is, thus, also incorrect. Choice (C), however, paraphrases the concern of those in the field who believe that Brod did not really comprehend Kafka's writing (although he saw its importance). That is the correct answer.