Which of the Following Statements Is True

Which of the following statements is true?

A) The method used in regression analysis for incorporating a categorical variable into the model is by organizing the categorical variable into one or more indicator variables.
B) An indicator variable is a dependent variable whose value is set at either zero or one.
C) There are four possible responses listed for marital status. Based on this, four indicator variables will need to be created and incorporated into the regression model.
D) On a survey there is a question that asks whether someone lives in a house, apartment, or condominium. These three responses could be coded in an indicator variable using values of 0, 1, and 2.
E) The scatterplot can show whether using an indicator variable in the model is appropriate. However, it gives no clue about using an interaction term.