MLV Choose the statement that best describes how endogenous variables differ from exogenous variables. O A An endogenous variable is explained within the theory, while an exogenous variable influences the endogenous variables but is determined outside the theory An endogenous variable is a flow, while an exogenous variable is a stock. An endogenous variable is explained outside the theory and influences an exogenous variable while an exogenous variable is explained within the theory. D An exogenous variable is a function of the endogenous variable, and both are flow variables