Olfactory Sensory Neurons with a Mutation That Prevents Them from Firing

Olfactory sensory neurons with a mutation that prevents them from firing action potentials in response to odorants usually do not survive to project to glomeruli because

A) they cannot follow the ephrin gradient.
B) they cannot follow semaphorins.
C) their neighbors fire competing action potentials.
D) the mutation triggers apoptosis.