Difficulty: Easy
Correct Answer: the subsequent events proved that he was innocent
Explanation:
Concept
"Although" introduces a contrast with what follows. If early probes pointed to him, a contrasting resolution is that later events cleared him.
Option analysis
the subsequent events proved that he was innocent — direct contrast and grammatically correct. ✅(a), (b), (e) all reinforce guilt and so do not contrast the concessive setup.(c) is ungrammatical ("was guilt").
Final Answer
the subsequent events proved that he was innocent.
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