A group of biologists is studying the competitive relationship among strains of bacteria that exist in the guts of fish. What is their primary objective?

A) To identify the most abundant strain of bacteria in the fish guts.
B) To determine how temperature affects bacterial growth in the fish guts.
C) To investigate how different strains of bacteria compete for resources in the fish guts.
D) To analyze the genetic composition of the bacteria found in the fish guts.