Answer
D.
Work Step by Step
B. can be excluded since the endosperm would have to have three sex chromosomes since it is triploid. A. is wrong since the endosperm would have the two X chromosomes from the female parent and the same sex chromosome as the embryo in a given embryo/endosperm pair (A. has the opposite). C. is wrong since the second option in that choice has two (Y) male chromosomes in the endosperm when the sperm only donates one to the endosperm.