单选急求Children are curious___nature and adults

题目

单选急求Children are curious___nature and adults
Children are curious___nature and adults should encourage their natural curiosities.
A. on
B. at
C. for
D. by
选什么?为什么?
答案是D。1.3楼俩瞎说。2楼你那句子和我不一样，我要的是完整的，

答案

D
小孩生来好奇.
就是说小孩对新鲜的事物总是充满好奇心.
有答案为证