Which of the following statements is true for the transtheoretical model (ttm)?
a. ttm is a theory about how subjective values and subjective probability affect people's behavior choices.
b. ttm is a theory about how learning results from reinforcement.
c. ttm is a value-expectancy theory.
d. ttm is a theory about stages of change regarding people's health-related behavior.

d) TTM is a theory about stages of change regarding people's health-related behavior.

Explanation: Transtheoretical Model(TTM) is the biopsychosocial model that based on the change of behavior in integrative manner. This theory consist of six stages that showcase the change and progress in heath-related behavior.

The six changes in the health behavior are as follows:

Other options are incorrect because TTM is not related with Value expectancy theory, learning things and subjective probability and values  changing the decisions .Thus, the correct option is option(d).

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