Hey Olivia! This question is asking us about the viewpoint of the late 19th century biochemists. Hopefully as we were reading the passage, we marked down (with a V!) that the latter half of the second paragraph is where we most explicitly get those biochemists' views. So to Pre-Phrase this question, I would come back to that portion of the passage. Specifically, we are told:
Many biochemists, on the other hand, remained skeptical of the idea that so much structure existed, arguing that the chemical reactions that occur in cytological preparations might create the appearance of such structures. Also, they stood apart from the debate then raging over whether protoplasm, the complex of living material within a cell, is homogeneous, networklike, granular, or foamlike. Their interest lay in the more "fundamental" issues of the chemical nature of protoplasm, especially the newly formulated enzyme theory of life.
When I come down to my answer choices, I'm going to look for one that is explicitly supported by that portion of the passage.
Answer Choice (A): The quoted portion of the passage explicitly supports the
opposite of this; biochemists were skeptical about cell structure.
Answer Choice (B): This is the right answer. It lines up very nicely with the last sentence of the quoted portion of the passage, which states that biochemists were primarily interested in the chemical nature of protoplasm.
Answer Choice (C): Nowhere in that area of the passage (or indeed anywhere in the passage) are "behavioral patterns" mentioned.
Answer Choice (D): The biochemists are interested in the
chemical nature, not the
physical nature, of protoplasm.
Answer Choice (E): Nothing in our relevant area of the passage says anything about how the methods of chemistry must be supplemented.
So our quoted area of the passage gives clear textual support for (B), but no support for the others. Hope that helps!