Kendra Is Having Difficulty Deciding Between Two Cars, a and B

Multiple Choice

Kendra is having difficulty deciding between two cars, A and B. As shown in the accompanying diagram, A has more cargo room than B, but lower gas mileage. Ideally Kendra would like a car both with a lot of cargo room and good gas mileage.  
 If Kendra behaves like most decision-makers, then the addition of option C would:

A) decrease her likelihood of buying a car.
B) have no impact on her choice of A and B.
C) increase her likelihood of picking A.
D) increase her likelihood of picking B.