Q: You are presented with the quiz "a protein that prompts an immune response are found where?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "antigens are found on cancer cells and the cells of transplanted organs" and "an antigen is a protein that prompts an immune response to cancer cells". So, what's the best answer to the question?

Options are: a. the skin b. critical organs c. epidermis and dermis d. layers of fat e. Veins and arteries. f. at or near the margins g. Earth orbiting the Sun h. on cancer cells
A:
h.