문제 내용: 밑줄 친 부분 중 어법상 옳은 것은?
선택지 1: ①As the old saying go, you are what you eat. The foods you eat 2 obvious affect your body's performance.
선택지 2: ②They may also influence how your brain handles tasks.
선택지 3: ③ help you being concentrated, keep you motivated,
선택지 4: ④ even prevent your brain from aging.