在销售谈判过程中，深思后才反应，沉默是金；总是需要再上层的核准；时间就是金钱，具有这些谈判特点的国家是（）

A.美国

B.法国

C.日本

D.阿拉伯

If n is a positive integer, then n(n+1)(n+2) is （）.

A.even only when n is even

B.even only when n is odd

C.odd whenever n is odd

D.divisible by 3 only when n is odd

E.divisible by 4 whenever n is even