The Smiths have become increasingly alarmed by the changes occurring in their koi pond. The most recent concern is the reduction in the number of eggs. Which of the following statements is a plausible reason that would lead to a decrease in the number of eggs the koi are producing?
The farmer's market down the street has changed suppliers, and the produce is contaminated.
The farm next door practices flood irrigation, and runoff contaminated the koi pond.
The koi are unable to spawn because their reproductive system is impaired from pesticides the Smiths use to prevent termites.