问题详情

The word “this” (Para. 3, Line 1) the author means to say that ________.
A) there are more men on any given job than are needed
B) 33 per cent overmanning leads to 33 per cent less productivity
C) it is difficult to measure the intensity of work
D) Britons generally do not want to work too hard请帮忙给出正确答案和分析，谢谢！