Research suggests that when athletes who are preparing for a big game visualize themselves training really hard for the game, they ____; when they visualize themselves actually winning the game, they ____.
a. tend to actually train less than usual and thus perform worse; in fact perform better.
b. tend to actually train less than usual and thus perform worse; also actually tend to perform worse.
c. tend to train harder than usual and thus perform better; in fact tend to perform worse.
d. tend to train harder than usual and thus perform better; also tend to perform a little better.
Answer: D