다음 우리말을 영어로 가장 잘 옮긴 것을 고르시오. | [9급 국가직 영어] 07년 1회차 기출문제 상세 페이지

With an experiment conducted on American astronauts, it has been proven how important is body movement in maintaining strong, healthy bones.

An experiment done on American astronauts made clear that physical activity is important to retain strong, healthy bones.

With an experiment conducted on American astronauts proved that body movement is important to retain strong, healthy bones.