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
The issues:
1. The following idioms are correct:
-> Such X as Y
--> Such as X and Y
--> Such as X, Y, and Z
==> This kills the options B and E because they have wrongly used "infections like X and Y"
2. "something not considered a previous possibility" is changing the intended meaning of the sentence.
Previous possibility---is not like "previously considered possibly"
==> This kills D.
3. "of the other X such as .." is not correct. In this case the is a problem.
Besides, "to pursue + NOUN" should be the correct way. But in the option A, pursue + Clause has been used.
Answer is C.
