Answer:
The answer is mutualism.
Step-by-step explanation:
Ecological interactions, or any interactions between two living organism can be categorized in 4 different sections. Mutualism, commensalism, competition and parasitism or predation.
For the interaction described in the example in the question, we can definitely say that it falls into the mutualism category because the outcome is beneficial for both organisms.
The fruit of the tree keeps the primates alive and the primates help the tree reproduce succesfully.
I hope this answer helps.