Mark Is a Junior in College and Plans to Move

Mark is a junior in college and plans to move to his own apartment before his senior year. He hopes to quit drinking, get more sleep, and spend more time exercising and studying instead of spending so much of his free time on Facebook. The best plan for Mark to succeed is for him to

A) make a chart with an algorithm for coordinating all the changes.
B) try to change all of his bad behaviors at once.
C) select the most important behavior to change and take things one step at a time.
D) worry about changing behaviors later because he'll have plenty of time to change after he finishes college.