性格词汇，分不清楚？

It is impossible to get John to change his mind. He is very ______.

(A) tame

(B) flexible

(C) stubborn

(D) conducive

谁都无法叫约翰改变心意。他很固执。

(A) tame [ tem ] a. 温驯的

(B) flexible [ `flEksJbL ] a. 有弹性的

(C) stubborn [ `stVbJn ] a. 固执的

(D) conducive [ kJn`dyusIv ] a. 有益的

be conducive to one's health有益健康