The following economic model predicts whether a voter will vote for an incumbent school board member:

INCUMBENT = 1+2 MALE + 3 PARTY +4 MARRIED +5 KIDS

where INCUMBENT = 1 if the voter votes for them, 0 otherwise

MALE = 1 if the voter is a male

PARTY indicates the voter is registered with the same political party as the incumbent

MARRIED = 1 for married voters, 0 otherwise

KIDS is the number of school age kids living in the voters house.

If you hypothesize males and females might have a different willingness to vote for a candidate registered with a different political party, which variable should you add to the economic model to allow you to test the hypothesis?

a. MALE * PARTY

b. MALE * MARRIED

c. MARRIED * KIDS

d. MARRIED * PARTY