Most Fungi Are Adapted to Living and Thriving in Dark

Most fungi are adapted to living and thriving in dark environments, but some exist in areas exposed to light. Unlike fungi that live in the dark, why do many light exposed fungi have melanin in their cell walls?

A) To prevent them getting sunburnt
B) To darken their fruiting bodies, making them less likely to appear palatable to foragers
C) To help protect against UV-mediated DNA damage
D) Uupon ingestion, melanin reacts in acidic environments to produce a gastric irritant
E) All fungi can produce melanin, but when exposed to light the photons react with specialised chitin compounds to produce melanin