How Does the G Protein Activate Adenylyl Cyclase

Multiple Choice

How does the G protein activate adenylyl cyclase?

A) The G protein mediates the release of cAMP-dependent protein kinase, which activates adenylyl cyclase.
B) The G protein activates various second messengers, which all activate pathways that activate adenylyl cyclase.
C) The α subunit of the G protein, with GTP, diffuses laterally in the membrane and binds to and activates adenylyl cyclase.
D) The G protein causes a depolarization, which activates adenylyl cyclase.