The stage of change occurs when you’re aware that a problem exists and are seriously thinking about overcoming it, but haven’t yet made a commitment to take action.

a. self-monitoring
b. preparation
c. precontemplation
d. contemplation

I believe the answer is contemplation. The reason why is because during this stage of change, a person is aware they have a problem so they spend time thinking about that problem. Where as in the pre-contemplation stage, the person is not even thinking about the problem. In the preparation stage the person has thought about the problem, and is now making a commitment to change.

Sodium is the answer