The correct option is A Intraspecific competition
Mutualism is a type of interaction between two species, in which members of both species benefit from each other.
Predation is a type of interaction in which a member of one species kills and eats the member of the other species.The member who kills is called a predator and the member which gets killed is the prey.
Interspecific competition occurs between the members of different species.
Intraspecific competition occurs between members of the same species. Since the members of the same species compete for the same resources it is more severe.
High density elephant population in an area leads to intraspecific competition as all the members belong to the same species.
Hence the correct option is
d. Intraspecific competition