One theory proposes that in order to implement effective health behavior changes, an individual needs to have a specific plan, a positive attitude, and the belief that their social group is supportive of their plan. this theory is

theory of reasoned action

Explanation:

Theory of reasoned action -

The theory of reasoned action was given by Martin Fishbein and Icek Ajzen in the year 1967.

This theory helps to give the connection between the attitude and behaviour in the cation of the human being , is referred to as theory of reasoned action.

The theory helps to determine the behavior of an individual on the basis of some prior intentions and attitude .

Hence, from the given information of the question,

The correct term is theory of reasoned action.

this would and i think the answer is d