Isabel and Sam Have Not Been Able to Conceive Children

Isabel and Sam have not been able to conceive children for a long time. Their physician suggests that Isabel should have her eggs harvested and placed in a petri dish where they can be fertilized with Sam's sperm. He further suggests that the fertilized ova from the petri dish can be injected into Isabel's uterus. In this scenario, the doctor is suggesting:

A) artificial insemination.
B) the use of a surrogate mother.
C) adoption.
D) in vitro fertilization.