Here's a problem to solve: Why is competition among males during mating season important in some animal species?

Among the 4 following options, which is the correct answer?

- A: It ensures that genes from the fittest animals are passed on.
 
- B: It allows females to distinguish between adult and juvenile males.
 
- C: It provides the species with new ways of communication.
 
- D: It speeds the process of reproduction.
 