Final answer:
A male lion has the greatest potential for mating in a coalition of four unrelated males (B).
Step-by-step explanation:
The situation where a male lion has the greatest potential for mating is in a coalition of four unrelated males (B). In a coalition, the males work together to defend their territory and have a higher chance of successfully mating with females. This is because the coalition provides more protection and resources, making them more attractive to females.