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.

• Awhat they had not previously considered possible--better control, if not eradication, of the other infections such as  
• Bwhat they had not previously considered a possibility--better control, if not eradication, of such infections like  
• Csomething they had not previously considered possible-better control, if not eradication, of such infections as  
• Dsomething not considered a previous possibility--better control and perhaps eradication, of other infections such as  
• Ethe possibility of what they had not previously considered--better control and possibly eradication of infections like