帮我做道英语选择题呢,关于 consist of,be made up of的~

帮我做道英语选择题呢,关于 consist of,be made up of的~
G 8________ eight richest countries in the world is really powerful。
A：is made up of B：made up of C：consists of D：consisted of
选什么？是不是 G 8 which is made up of eight 这样的。各项帮我分析下，做一下两者比较~