Answer
C. adult stage
Step-by-step explanation:
Reproduction in flowers generally takes place during the adult stage. At this stage, the flower is fully developed and has reached its maturity, which means it has developed both male and female reproductive structures. The male reproductive structure is the stamen, which contains pollen, and the female reproductive structure is the pistil, which contains the ovules. During the adult stage, the pollen from the stamen is transferred to the pistil, where fertilization takes place, and the ovules develop into seeds.