Which revision best eliminates the vague pronoun reference in: 'The committee reviewed the proposal, but they rejected it because it was unclear'?
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A
The committee reviewed the proposal but rejected it because the proposal's scope was unclear.
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B
They reviewed the proposal, but it was rejected due to its unclear nature.
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C
The proposal was reviewed by the committee, but it was rejected.
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D
The committee rejected the proposal, which they found unclear.