It's easier to eliminate negative self-talk when we a. try not to think of the worst things that can happen. b. usually hear the negative thoughts we think. c. ignore the fears that trigger it. d. let it turn into imagined risks.

The correct answer in this case is either A or C. 

A is useful and very good because if you're not thinking about the worst thing that will happen to you in a certain situation, you will also eliminate a very important and limiting source of negative self-talk. 

C can be useful because ignoring fears that will trigger your negative self-talk can be useful as well, however, most people have difficulties simply ignoring fears.

For this reason I think the better answer is A.