B: Fungi are autotrophs that produce their own nutrients through photosynthesis.
C: Hyphae are filamentous structures that secrete enzymes to break down organic matter and then absorb the released nutrients.
D: Spores are primarily responsible for nutrient absorption, helping the fungus grow quickly.
Explanation
The text states that multicellular fungi extend filaments called hyphae, which secrete enzymes to break down organic matter and absorb the released nutrients. This directly matches option C.