Marcella Is Pregnant with Her First Child

Marcella is pregnant with her first child. She works at a manufacturing plant where she is exposed to radioactive chemicals. As a consequence of this exposure,

A) her baby is more likely to have an Rh-factor incompatibility.
B) her baby is more likely to have hemophilia.
C) she is more likely to have twins.
D) she is more likely to have a baby with a low birth weight.