Read the description of each situation and vividly imagine it happening to you. You have probably not experienced some of the situations, but that doesn't matter. Perhaps neither response will seem to fit; go ahead anyway and choose either A or B, choosing the cause likelier to apply to you. You may not like the way some of the responses sound, but don't choose what you think you should say or what would sound right to other people; choose the response you'd be likelier to have.
For more information, see the book Learned Optimism by Martin E. P. Seligman, from which this quiz is taken.