Hi there!
We can figure out which type of organism breaks dead leaves and decaying matter into food by looking at the characteristics of the different types you listed.
A. Herbivore - Feeds on plants
B. Omnivore - Feeds on plants and animals
C. Carnivore - Feeds on animals
D. Saprophyte - Feeds on dead or decaying matter
Therefore, from the options presented, D. Saprophyte is the correct answer.