Suppose That the Cells of Seed Plants, Like the Cells

Suppose that the cells of seed plants, like the cells of human skin, produce a pigment upon increased exposure to ultraviolet radiation. Which of the following types of plant cells is most likely to produce this pigment?

A) cells of a gametophyte
B) vascular cells in the root
C) epidermal cells of sporophyte megaphylls
D) cells of a megasporangium