Maria,who Just Found Out She Is Pregnant,wonders at What Point

Maria,who just found out she is pregnant,wonders at what point her baby will be able to hear.A competent doctor would tell her that her baby's sensory organs

A) begin to function during the embryonic phase.
B) will be functioning by the end of the second trimester.
C) do not function prior to the eighth or ninth month of pregnancy.
D) will not function prior to birth.