Final answer:
The structure of the flower that contains the pollen grains is the anther. The correct option is c.
Step-by-step explanation:
The part of the flower that contains the pollen grains is the anther. Pollen grains are the male gametophytes, and the anther is a sac-like structure at the tip of the stamen where pollen is produced. Within the anther, the microsporangium, or pollen sacs, host the development of microspores into pollen grains. The pollen contains two cells, a generative cell and a tube cell, and is protected by two layers, the intine, and the exine. Therefore, the correct answer to the student's question is (c) anther.