What Do(es) the Following Figures Suggest About Learning in Drosophila

Multiple Choice

What do(es) the following figures suggest about learning in Drosophila flies?

A) Learning may impose an evolutionary trade-off between its costs and benefits.
B) Long-lived flies were slower at learning than wild-type flies.
C) Fast-learning flies have shorter life spans than control flies.
D) b and c
E) all of the above