The author brings up the topic of the internation

The author brings up the topic of the international space station in order to______.

A．continue to stress the idea that what was previously thought impossible is now being achieved

B．indicate the next great achievement to be accomplished in the space program

C．demonstrate that the "Space Race" is now a cooperative effort between nations

D．convince the reader that the "space program is producing positive results

请帮忙给出正确答案和分析，谢谢！