Quentin Has a Food Truck in Which He Sells Mainly

Quentin has a food truck in which he sells mainly burgers and fries. He decided to expand his product line to begin serving grilled chicken sandwiches as well. Quentin is noticing that his existing customers now order the chicken over the burgers, and his sales have not increased, in fact, they have decreased slightly. This is most likely due to

A) poor marketing of the burger option.
B) cannibalization.
C) revitalization.
D) low brand equity.
E) differentiation.