Used as writing surfaces for hundred of years, medieval scribes preferred certain animal skins over others.
Meaning - animal skins were used as writing surfaces. Medieval Scribes (writers) preferred animal skins to other skins.
So 'animal skins' has to appear immediately after the modifier 'Used as writing surfaces for hundred of years,'
(A) medieval scribes preferred certain animal skins over others -
This changes the meaning to medieval scribes being used as writing surfaces.(B) animal skins were viewed as preferable to medieval scribes -
modifier error has been rectified here. But meaning has changed. It means animal skins were preferred rather than medieval scribes. Doesn't make sense.(C) medieval scribes preferred using certain animal skins to others -
Same error as in A(D) animal skins were used by medieval scribes, who preferred some skins to others -
CORRECT.
(E) medieval scribes, preferring certain animal skins to others -
Same error as in A