Answer:
D. Preparation
Explanation:
In the Preparation stage, people are ready to take action within the next 30 days. People take little steps toward the behaviour change. In the case of Mackenzie he says he is starting to so physical activity in two weeks, so this characteristic corresponds to the preparation stage. He is not taking action yet not maintaining it either. He is not precontemplating because he already consider taking action and decided it, so he is not contemplating either.