producing chemicals that destroy the microbes dissolving wastes from the microbes creating recessive genes in the microbes supplying oxygen and nutrients to the microbes
I gave my students this multiple choice question: Specialized cells protect the human body from disease-causing microbes by

Only one answer is correct among these 4 choices:
- producing chemicals that destroy the microbes
- dissolving wastes from the microbes
- creating recessive genes in the microbes
- supplying oxygen and nutrients to the microbes

Could you tell me which one is correct?

producing chemicals that destroy the microbes