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件并不了解:
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。