Listening to peaceful music. as well as taking exercise, a lot in relieving people 's sad

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A. help
B. helped
(答案→)C. helps
D. are helping
解析：句意：听宁静的音乐和锻炼有助于缓解人们的悲伤的情绪。主语是被as well as连接的两个主语时，谓语和前面的主语保持一致，这里和Listening to peaceful music一致，因为是动名词，所以用单数谓语，所以选C。