In the Section "Investigating Life: the Nerve of Those Clams!",how

In the section "Investigating Life: The Nerve of Those Clams!",how would exposure to saxitoxin from algae cause genetic changes in clams?

A) Saxitoxin would cause mutations to occur in the clam's DNA.
B) Saxitoxin would increase the mutation rates in clams.
C) Saxitoxin would select existing mutations in the clam population.
D) Clams sensitive to saxitoxin would migrate away from the algae bloom.
E) Clams would want to change their Na⁺ transporters to become resistant to saxitoxin.