The survival of many endangered species of fish in our rivers depends on both the enforcement of regulations and recreational activities being available apart from fishing.

(A) on both the enforcement of regulations and recreational activities being available
(B) both on the enforcement of regulations on recreational activities
(C) on both the enforcement of regulations and the availability of recreational activities
(D) on the enforcement of both regulations and recreational activities
(E) on both the enforcement of regulations in combination with available recreational activities


OA is C
At first, I went for A but how correct is option C? An Expert contribution will be appreciated