一道 SAT 语法 句子改错题!

一道 SAT 语法 句子改错题!
6.Today’s political candidates may reach wide audiences by appearing on （television,but old-fashioned barnstorming still has value because it allows） the electorate to meet candidates face to face.
A.television,but old-fashioned barnstorming still has value because it allows
B.television,but old-fashioned barnstorming still would have value because of allowing
C.television; however,there is still value in old-fashioned barnstorming by allowing
D.television,old-fashioned barnstorming still having value because it allows
E.television,when old-fashioned barnstorming still has value in allowing