Pollen
Explanation:
The pollen is a component of the male part of a seed plant.
A) Embryo; wrong because this is the female part. Female organisms do not produce sperm.
C) Seed; this is the compartment that keeps the embryo safe; it doesn't produce sperm.
D) Xylem; wrong because this is a vascular tissue, which has nothing to do with fertilization, reproduction, and males vs. females.
Hope this helps!