The influence of weather on corn

Cross-pollination is often easily restricted by environmental conditions, and it is impossible to get pollination opportunities. For example, wind-borne pollination is windless, and insect-borne pollination is due to strong wind or low temperature. In the flowering season of corn, if it rains continuously, it will reduce the yield of corn, and not enough insects will fly out to pollinate, thus reducing the chance of pollination and fertilization and affecting the yield of fruits and seeds. In order to make up for the lack of pollination in natural state, if supplemented by artificial pollination.

So choose: B.