A.I. Explanation:

Option 1: "indirectly have an influence on bees."

Explanation: This option is incorrect because the text states that pesticides directly affect bee health, not indirectly. The study emphasizes the direct impact of pesticides on fertility and population growth, making this option misleading.

Option 2: "reduce bees’ fertility rates."

Explanation: This option is correct as the text clearly states that female bees exposed to insecticides as larvae had 20% fewer offspring. This directly indicates a reduction in fertility rates, aligning perfectly with the findings of the study.

Option 3: "promote population growth of bees."

Explanation: This option is incorrect because the text indicates that exposure to pesticides leads to a lower population growth rate, specifically stating a 72% reduction in population growth for bees exposed to pesticides. Therefore, this option contradicts the information presented.

Option 4: "have lower and lower effect if bees repeatedly expose to them."

Explanation: This option is incorrect as the text suggests that repeated exposure to pesticides has additive effects, leading to more severe consequences for population growth, rather than a diminishing effect. The study highlights that repeated exposure results in a significantly lower population growth rate.