An inhibitor of phosphodiesterase activity would have which of the following effects?
A. prolong the effect of epinephrine by maintaining elevated cAMP levels in the cytoplasm
B. decrease the amount of cAMP in the cytoplasm
C. block the response of epinephrine
D. block the activation of G proteins in response to epinephrine binding to its receptor
E. block the activation of protein kinase A
Answer: A