According to Bill Bridges, what are the two signs that one is ready to leave the neutral zone and move to a new beginning?

a. Crisis and commitment.
b. You have met your basic need for food and shelter and are ready to examine your need for love and belonging.
c. The reaction of your friends and your own certainty that you've found a path you want to follow.
d. A stable progression of changes and a successful analysis of nature versus nurture.

C