A particular drug inhibits the protein kinase that is responsible for phosphorylating the CREB protein. How would

Question:

A particular drug inhibits the protein kinase that is responsible for phosphorylating the CREB protein. How would this drug affect the following events?
A. The ability of the CREB protein to bind to CREs
B. The ability of extracellular hormones to enhance cAMP levels
C. The ability of the CREB protein to stimulate transcription
D. The ability of the CREB protein to dimerize