The Limbic Region of the Brain Is Most Active When

The limbic region of the brain is most active when

A) contemplating a future pay-off ($30 in two weeks) .
B) contemplating a long term investment (stock in a new company that is not projected to turn a profit until its second year) .
C) remembering a past problem that was solved through thought and logic.
D) receiving an immediate cash award ($10 cash now) .
E) attempting to create a series of math questions for a high school math class.