—I think everyone has a role to play in making the planet a better place.—Yes indeed. .A

问题补充：

—I think everyone has a role to play in making the planet a better place.

—Yes, indeed. .

A. I’m with you on that

B. That couldn’t be better

C. You have got something

D. I’ll do my best

答案：

(答案→)A. I’m with you on that

B. That couldn’t be better

C. You have got something

D. I’ll do my best

解析：情景交际。A.我同意你这个观点 B. 那再好不过了C. 你已经明白了D.我 将尽我最大努力。句意：我认为在是这个星球变成一个更好的地方中每个人都有他的作用。——是的，事实上。结合语境可知选A最符合语境。