Cocaine Abusing Women Who Become Pregnant Find That They

Cocaine abusing women who become pregnant find that they

A) require less cocaine to achieve a certain degree of euphoria than they did before becoming pregnant.
B) require about as much cocaine as before to achieve the same degree of euphoria.
C) require more cocaine than they needed before becoming pregnant to achieve the same degree of euphoria.
D) are able to achieve the same degree of euphoria as before only if they also abuse alcohol concurrently.