An error in the dna checkpoints by dna polymerase during dna replication could pass on to future offspring only if

a) the mutation occurred in the gametes
b) mutations caused by dna polymerase won’t pass on to offspring
c) the mutation was caused by an environmental mutagen in the liver cells
d) the mutation occurred in the skin cells

all of the following are examples of environmental mutagens except

a) pesticides
b) x-rays
c) viruses
d) sunlight