If a plant relies on wind or insects to carry pollen, why may cross-pollination decrease when those agents are absent?

Correct answer: Fewer pollen grains will reach the stigma of another plant

The correct answer is A. Cross-pollination requires pollen to move from a flower on one plant to a flower on another. For plants that rely on wind or insects, the absence of those agents means fewer pollen grains may reach another plant’s stigma.