Imagining potential negative big events is one way that a person can manage his or her stress. to deal with imagining the event, one should
a. think positively
b. relax with deep breathing
c. have a back-up plan
d. be confident

I would have to say any one is a good choice so look at it like this...
a. you are doing the opposite and seeing everything going well and nothing wrong happening
b. this will help calm you down and make you more likely to be in a better state of mind 
c. this is always good because everything does not happen correctly the first time. 
d. this is a really good one because confidence is key but it depends on the situation .

my best bet would be that it is c