Which of the following factors can reduce the population of a community?

A.

Immigration

B.

edaphic

C.

predation

D.

mutualism

Correct answer is C

Predation include all interactions in which one organism consumes all or part of another. This includes predator-prey, herbivore-plant, and parasite-host interactions.

Migration is the movement of individuals of a species from one place to another.
Mutualism is the way two organisms of different species exist in a relationship in which each individual benefits from the activity of the other.

Edaphic factor is an abiotic factor relating to the physical or chemical composition of the soil found in a particular area.