Marcella,pregnant with Her First Child,works in a Manufacturing Plant That

Marcella,pregnant with her first child,works in a manufacturing plant that produces semiconductor chips.As a consequence of Marcella's exposure to heavy metals,

A) her baby is more likely to have an Rh-factor incompatibility.
B) her baby may have below average intelligence.
C) she is more likely to have twins.
D) she is at-risk for developing hypertension during pregnancy.