Suppose That the Cells of Seed Plants, Like the Skin

Suppose that the cells of seed plants, like the skin cells of humans, produce a pigment upon increased exposure to UV radiation. Rank the following cells, from greatest to least, in terms of the likelihood of producing this pigment.
1) cells of sporangium
2) cells in the interior of a subterranean root
3) epidermal cells of sporophyte megaphylls
4) cells of a gametophyte

A) 3, 4, 1, 2
B) 3, 4, 2, 1
C) 3, 1, 4, 2
D) 3, 2, 1, 4
E) 3, 1, 2, 4