Exposure to 10 NCi for 10 Minutes Is More Hazardous

Multiple Choice

Exposure to 10 nCi for 10 minutes is more hazardous for a child than for an adult because

A) the child's cells are dividing more rapidly than the adult's and are, therefore, more susceptible to the radiation.
B) the child's smaller body size makes the effective dose larger for the child than for the adult.
C) the child's immune system is not developed well enough to resist damage.
D) the child's skin is not as thick as an adult's and cannot block as much radiation.
E) None of the above reasons is correct.