阅读下列短文, 从给的四个选项 (A、B、C和D) 中, 选出最佳选项。
(2013·合肥市二模，E)
Telling fewer lies benefits people physically and mentally. Anita Kelly, study author and professor of psychology at the University of Notre Dame, employed 110 adults for her study. She divided them into two groups and asked one group to stop lying for 10 weeks. Lies included big ones and tiny ones—any false statements—but participants were still allowed to leave out the truth, keep secrets and avoid questions they didn't want to answer, etc. The other group wasn't given any special instructions about lying.
