Old Rats Cannot Maintain a Long-Lasting Avoidance Memory Because _______

Old rats cannot maintain a long-lasting avoidance memory because _______. (Select all that apply.)

A) avoidance training does not initiate the release of epinephrine
B) avoidance training does not initiate CREB phosphorylation
C) they cannot mount a glucose response
D) glucose does not cross their blood brain barrier
E) None of the above