Question: People may remove fallen trees from forests to reduce fire risk. Removing the trees is now thought to have an impact on the health of the forest. Which impact would removing fallen trees from forests most likely have on forest health?

What is the correct answer to the question from the following choices?
Available options: [I] increased risk of forest fire [II] increased food sources for forest fungi [III] decreased soil fertility by preventing nutrient recycling [IV] decreased forest vegetation by increasing sunlight penetration
[III]