The answer to the question above is D. Mushroom. Mushroom is not the abiotic factor in ecosystem. Rain, shade, and sunlight are an abiotic factor in ecosystem. An abiotic factor is a nonliving factor in the ecosystem that affects those living organism in the ecosystem.
Abiotic means not living, and rain isn't living, shade isn't living, and sunlight isn't living, but mushrooms are living, so the correct answer is "d. mushrooms."