a mixture a solution an element a compound
I gave my students this multiple choice question: Betsy tries to attract a variety of birds to her backyard. She puts up a bird feeder that contains sunflower seeds and corn. Which term best describes the contents of the bird feeder?

Only one answer is correct among these 4 choices:
- a mixture
- a solution
- an element
- a compound

Could you tell me which one is correct?

a mixture