by attaching to green plants and taking the plants' food by combining carbon dioxide and water to make its own food by absorbing matter from dead organisms to use as food by attacking bacteria and using the bacteria as food
I gave my students this multiple choice question: How does a mushroom obtain energy?

Only one answer is correct among these 4 choices:
- by attaching to green plants and taking the plants' food
- by combining carbon dioxide and water to make its own food
- by absorbing matter from dead organisms to use as food
- by attacking bacteria and using the bacteria as food

Could you tell me which one is correct?

by absorbing matter from dead organisms to use as food