Thanks to medical research, many diseases which might have been fatal at one time are now easily prevented by childhood vaccines.


A. which might have been fatal at one time are now easily prevented by childhood vaccines

B. that might have been fatal at one time are now easily prevented for childhood vaccines

C. which might at one time have been fatal without childhood vaccines

D. that might have been fatal at one time are now easily prevented by childhood vaccines

E. which might, without the current prevention by childhood vaccines, have been fatal


OA after sometime!