Which thesis statement below is less effective ？

A.Preparing for a PowerPoint presentation can really be quite easy.

B.In this essay I want to discuss what the government should do to help homeless children.

C.You can acquire a competitive spirit by practicing five personality traits.

D.New employees must go through four training sessions before they start to work.

正确答案：In this essay I want to discuss what the government should do to help homeless children.