IMO :E
Explanation
(A) If the nursing profession solves the problems of low wages and high-stress working conditions, it will attract able applicants in greater numbers than it currently does. -------greater number of applicants than current (Incorrect)
(B) The nursing profession will have to lower its entrance standards if the pool of able applicants to nursing school does not increase beyond the current level.--------it is one of the possibility, will have to is not correct (Incorrect)
(C)
...
Explanation
(A) If the nursing profession solves the problems of low wages and high-stress working conditions, it will attract able applicants in greater numbers than it currently does. -------greater number of applicants than current (Incorrect)
(B) The nursing profession will have to lower its entrance standards if the pool of able applicants to nursing school does not increase beyond the current level.--------it is one of the possibility, will have to is not correct (Incorrect)
(C)
...



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