To answer this question, we need to understand the meaning of the word "conspicuous."
Option A) opaque - This option is incorrect. The word "opaque" means something that is not transparent or not easily seen through. It does not convey the meaning of being obvious or easily noticed, which is the meaning of "conspicuous."
Option B) crystal clear - This option is correct. The phrase "crystal clear" means something that is very clear, obvious, or easily seen. In the context of the given statement, it means that it was very obvious or easily noticed that Chandler was being cheated.
Option C) doubtful - This option is incorrect. The word "doubtful" means uncertain or not easily believed. It does not convey the meaning of being obvious or easily noticed, which is the meaning of "conspicuous."
Option D) unbelievable - This option is incorrect. The word "unbelievable" means something that is difficult to believe or not credible. It does not convey the meaning of being obvious or easily noticed, which is the meaning of "conspicuous."
The correct answer is B) crystal clear. This option is correct because it accurately conveys the meaning of "conspicuous" as something that is obvious or easily noticed.