In Pines, the Immature Male Gametophyte Consists Of

In pines, the immature male gametophyte consists of:

A) two prothallial cells, one generative cell, and one tube cell.
B) one prothallial cell, two generative cells, and one tube cell.
C) one prothallial cell, one generative cell, and two tube cells.
D) two prothallial cells, two generative cells, and one tube cell.
E) one prothallial cell, one generative cell, and one tube cell.