Which of the Following Statements Is NOT True of Combining

Which of the following statements is NOT true of combining vowels?

A) Combining vowels can join one root to another root.
B) Examples of combining vowels are "o" and "a."
C) A combining vowel has no meaning of its own.
D) A combining vowel makes a word easier to pronounce.
E) A combining vowel is needed when the suffix begins with a vowel.