문제 내용: 다음 글의 제목으로 가장 적절한 것은?
  One of the areas where efficiency can be optimized is
  the work force, through increasing individual productivity
  -defined as the amount of work (products produced,
  customers served) an employee handles in a given time.
선택지 1: ① How to Create More Options in Life
선택지 2: ② How to Enhance Daily Physical Performance
선택지 3: ③ Multitasking is the Answer for Better Efficiency
선택지 4: ④ Do One Thing at a Time for Greater Efficiency