单选题:下列叙述中属于内源性动机的是(  )。

题目内容:
下列叙述中属于内源性动机的是(  )。 A.对活动本身感兴趣,活动使人获得满足
B.为了避免受到惩罚而完成工作
C.为了赢得他人的好评而努力工作
D.为了获得物质奖励而付出努力
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