The success of the program to eradicate smallpox has stimulated experts to pursue what they had not previously considered possible−better control, if not eradication, of the other infections such as measles and yaws.
(A) what they had not previously considered possible−better control, if not eradication, of the other infections such as
(B) what they had not previously considered a possibility−better control, if not eradication, of such infections like
(C) something they had not previously considered possible−better control, if not eradication, of such infections as
(D) something not considered a previous possibility−better control and perhaps eradication, of other infections such as
(E) the possibility of what they had not previously considered possible−better control and possibly eradication of infections like