Question: A lake that received runoff from surrounding farmland had a healthy fish population. Several years ago, a new type of pesticide was used to treat crops. As runoff entered the lake, it killed an insect that was a primary food source for fish. Which will most likely occur if farmers in the area stop using the pesticide?

  Options: 
 A. The population of fish will increase.
 B. The insects will become more resistant to the pesticide.
 C. The lake will be unable to support life.
 D. The fish will find another food source. 
Answer: A