Which Feature Characterizes the Trophoblast

Multiple Choice

Which feature characterizes the trophoblast?

A) Trophoblast cells adhere to each other but lack adhesion molecules on their exposed surfaces.
B) The trophoblast digests its way into the endometrium until it is fully embedded in the uterine wall.
C) The trophoblast is the last extraembryonic membrane to form in placental mammals.
D) Trophoblast cells use proteolytic enzymes secreted by the inner cell mass.
E) The trophoblast surrounds the zona pellucida.