Final answer:
The male gametophyte consists of 1 tube cell and 2 sperm cells, making option A the correct answer.
Step-by-step explanation:
The male gametophyte in seed plants is formed within the pollen grain, which typically consists of two types of cells: a tube cell and a generative cell. The generative cell is contained within the tube cell, and after the pollen grain adheres to the stigma of a flower, it germinates, forming a pollen tube that grows into the style. The generative cell then divides to form two sperm cells, which travel inside the pollen tube towards the ovule.
Therefore, the correct answer to the question 'What does the male gametophyte consist of?' is A. 1 tube cell and 2 sperm cells.