Task: Question Answering
Input (English): If \(2a + 4b = \sqrt { k } \), then \((a + 2b)\sqrt { k } \) =
(A)\(3k\) (B)\(2k\) (C)\(k\) (D)\(\frac { k } { 2 } \) (E)\(\frac { k } { 4 } \)
Output (English): D