Which of the following statements does NOT correctly describe the events following fertilization?

Select one:

a. Only the inner cell mass cells in a blastocyst are pluripotent.

b. The trophoblast has an important role in maintaining the pregnancy, as it prevents the endometrium from shedding.

c. As hCG takes over maintaining the endometrium immediately after implantation, the corpus luteum degenerates into the corpus albican.

d. All 16 cells in a morula are truly totipotent, meaning that they can become any cells in the human body.