The research paper's methodology was criticized for being opaque, with reviewers noting that key procedures were described so vaguely that other scientists would struggle to replicate the experiments.
As used in the text, what does the word "opaque" most nearly mean?
transparent
unclear
expensive
original
Correct Answer: B
Choice B is the best answer. The passage states procedures were "described so vaguely" that replication would be difficult, indicating lack of clarity. "Unclear" captures this sense of being difficult to understand or see through.
Choice A is incorrect because "transparent" is the opposite of vague. Choice C is incorrect because "expensive" refers to cost, not clarity. Choice D is incorrect because "original" refers to novelty, not comprehensibility.