I would say "B." is the most appropriate for this passage.
The verb used would be ‘is’ because we’re talking about a group of people in the present tense. I feel we would use ‘are’ only if there were specific things were were talking about, like [we] are, [you] are, [jack and jill] are, etc. Though, this wouldn’t be the case with he and she, because they always need to be in present tense.
Answer:
The teenage son had a very messy room that hadn't been cleaned in ages.
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Answer: Top 10 questions science experts can‘t answer
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