Using the standard 26-letter alphabet, how many different groups of 4 letters are possible, if exactly two letters are chosen from a, e, i, o ,u and two letters are chosen from all the remaing letters except for y, and a letter can be used more than once?

 (A) 500
 (B) 1900
 (C) 2500
 (D) 3150
 (E) 6300
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