Which theory states that in order for people to make a change in their health behavior, they must have an intention to do so, a positive attitude about the behavior, and a view that their social network will be supportive?
a) stages of change model
b) social cognitive model
c) self-determination theory
d) theory of reasoned action

Your answer is simply stages of change model
 
Definition-The Transtheoretical Model (also called the Stages of Change Model), developed by Prochaska and DiClemente in the late 1970s, evolved through studies examining the experiences of smokers who quit on their own with those requiring further treatment to understand why some people were capable of quitting on their own.

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