The correct option is:

c. endogenous factors.

Endogenous factors are dependent variables in the social science model. The value of endogenous factors is determined by the other factors that are independent and influencing the model, known as exogenous factors. These factors may have a positive or negative correlation.

For Example- Personal disposable income and personal consumption are two factors where consumption is an endogenous factor as it is dependent on the income and income is an exogenous factor.