Eddie asked each member of their class if they have their own car and also if they have a part time job. He determined that 7 students had their own car and 13 did not have a car. 6 of the students that had a car also had a part time job. In the entire class there were a total of 10 people that had a part time job. How many students didn't have a part time job and also didn't have a car?
A.4
B.7
C.9
D.13