The questions in this group are focused on sentence correction. Select a best phrase to replace the underlined portion in that sentence. 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. both on the enforcement of regulations and on recreational activities
B. on both the enforcement of regulations and the availability of recreational activities
C. on the enforcement of both regulations and recreational activities
D. on both the enforcement of regulations in combination with available recreational activities
