Which option below correctly compares the amount of radiation exposure from an annual dental X-ray and the radiation exposure from background radiation during the same year?

A. The dose from the dental X-ray is 8000 times smaller than the
average annual dose of background radiation.
B. The dose from the dental X-ray is 8000 times larger than the
average annual dose of background radiation.
C. The dose from the dental X-ray is 20 times larger than the average
annual dose of background radiation.
D. The dose from the dental X-ray is 20 times smaller than the
average annual dose of background radiation.