number of eggs laid size of the cage amount of food age of hens
I gave my students this multiple choice question: Sally noticed that there was a decline in the number of eggs her hens were laying. She decided to investigate if the decline might be caused by the amount of food she was feeding the hens. Which would be the dependent (responding) variable in Sally's investigation?

Only one answer is correct among these 4 choices:
- number of eggs laid
- size of the cage
- amount of food
- age of hens

Could you tell me which one is correct?

number of eggs laid