Male-Only Care Is Rare in Insects with Internal Fertilization but Is

Male-only care is rare in insects with internal fertilization but is found in the giant water bug. What hypothesis explains this observation?

A) Males mate exclusively with one female.
B) Males mate repeatedly with a female whose eggs he cares for.
C) Females are physiologically incapable of providing care.
D) Females would cannibalize eggs if males did not provide care.
E) Only males can defend eggs from predators.