Question 11
Christy wants to find out if the birds that visit the bird feeders in her backyard would rather build nests in birdhouses or in trees. She puts a birdhouse next to the feeder containing sunflower seeds and hangs a feeder containing cracked corn from a tree. She observes the birds' nesting activities over the next two weeks and records her observations. Which of the following would improve Christy's investigation?

A) setting up a third bird feeder containing fruit near a bird bath

B) putting the same kind of food in both feeders

C) setting the feeders up closer to each other

D) putting more food in both bird feeders