Following Activation of a Receptor,which Sequence Below Represents the Correct

Following activation of a receptor,which sequence below represents the correct order in which components will be involved in a signaling pathway that utilizes the second messenger cAMP?

A) G protein → cAMP → adenyl cyclase → protein kinase
B) G protein → adenyl cyclase → cAMP → protein kinase
C) adenyl cyclase → cAMP → G protein → protein kinase
D) cAMP → adenyl cyclase → protein kinase → G protein
E) protein kinase → G protein → adenyl cyclase → cAMP