My two cents - I picked B in a hurry saw the timer turn and red and read A again - realized it was the classic wordiness which got me as A makes much better sense if we break it down.
Some who favor putting governmental enterprises into private hands suggest that conservation objectives would in general be better served if private environmental groups were put in charge of operating and financing the national park system, which is now run by the government.
Which of the following, assuming that
...
Some who favor putting governmental enterprises into private hands suggest that conservation objectives would in general be better served if private environmental groups were put in charge of operating and financing the national park system, which is now run by the government.
Which of the following, assuming that
...






