Identify the part of the sentence that contains a grammatical error.
A. The company's data, B. which has been collected and analyzed, C. for over a decade, D. support the conclusion that the new strategy is ineffective.
A.The company's data
B.support the conclusion that the new strategy is ineffective.✓ Correct
C.which has been collected and analyzed
D.for over a decade
Explanation
'The company's data' is singular, so the verb should be 'supports' not 'support'. The error lies in part D where subject-verb agreement is violated.
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