Elephants exhibit herding behavior. When they travel, the oldest and largest members often travel on the outer edges of the group. Why is this important to the survival of the species?

A.
Elephants have few offspring, so they need to protect them from predators.
B.
Elephants have large numbers of offspring, so they need an organized system of travel.
C.
This arrangement allows adult members of the groups to spot mates.
D.
This arrangement allows young members of the group to spot food more easily.