중3 성취도 평가 문제인데요
그림이 세명이 밑에 있고 두명이 그 위에 그리고 한명은 손을 뻗고 서있는 그림인데요. 단어의 쓰임이 옳지 않은 것은?

the human pyramid shown in this picture is an exercise that can be done with six people. the three strongest people get on their hands and knees to form the 1) base.
the next two strongest people get on the 2) backs of the first three people. they will also be on their knees, but with one hand down and one hand out to the 3) front.

finally the last person climbs to the 4) top and stands up.
to complete the human pyramid, the person keeps his or her arms straight 5) up.

이중에 답이 무엇일까요 ㅜ.ㅜ