问题详情

In the United States, a proposal to make a change to the Constitution must first be approved by______ of the majorities of both Houses of Congress and then ratified by ______of the states.

A．two-thirds, two-thirds

B．two-thirds, three-fourths

C．three-fourths, two-thirds

D．three-fourths, three-fourths

请帮忙给出正确答案和分析，谢谢！