This membrane protein receives signal molecules and causes a change in the cell. A. Transport protein
B. Attachment protein
C. Receptor protein
D. Enzymes

B

Explanation:

some fungi obtain their nutrients from a living host (plant or animal) and are called most biotrophic fungi have fairly narrow host ranges—they are specialized on a limited called rhizomorphs that allow the fungus to grow from one tree to another. ascospores are formed inside a sac-like structure called an ascus. so your answer is a