Answer: Fungus growing on dead leaves
Step-by-step explanation:
A decomposer is something that feeds on dead or decaying organisms so they can decompose and allow the cycle of life to continue. All
A pizza isn't an organism, so that for sure not.
It says the bacteria are growing, and that's pretty much the opposite of decomposing so this one neither.
The fungi itself is making an antibiotic, so since it's not breaking up a dead organism, it can't be this either.
Since leaves are an organism, and it is dead, it makes sense for a fungi to decompose it. Not all fungi are decomposers, but the vast majority are.
Hope that helped a lot. Let me know any further questions.
:)