Beckwith Evaluates Several Arguments for the Permissibility of Abortion and Concludes

Beckwith evaluates several arguments for the permissibility of abortion and concludes that they all fail. He finds fault with the argument from a woman's right over her own body, the argument from abortion being safer than childbirth, and Judith Jarvis Thomson's famous "violinist" argument.
-Beckwith asserts that the unborn entity in the pregnant woman's body is

A) indeterminate.
B) not a part of her body.
C) unknown.
D) a part of her body.