Mrs. Roberts' class was designing science experiments. Carl and his partner decided to use the outdoor classroom as their laboratory. Since there was a bird feeder in the outdoor classroom, they decided to design an experiment about the feeding habits of birds in their area. Which question would be MOST appropriate to guide the scientific investigation?

A) What do birds eat?
B) What type of seeds do birds prefer?
C) Which seeds do our feeder birds prefer?
D) Which types of seeds do our feeder birds eat?