单项选择题

People were not fully aware that peace of mind was very important for health.

A．人们过去并未充分了解心灵的宁静对健康极为重要。
B．如果人们能感觉到大脑的平静，那将对健康极为重要。
C．人们过去对于心灵的宁静对健康的极端重要性并不了解。
D．大脑的平静对健康极为重要，这一点人们尚未充分意识到。
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