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答案：D
解析：
Triangle ABC is congruent to triangle DEF, so the lengths of the three sides of triangle DEF are the same as the lengths of the three sides of triangle ABC. Triangle ABC is a 30 degrees - - 90 degrees triangle with hypotenuse of length 12, so the other two sides of triangle ABC have lengths 6 and 6 times (square root 3). Therefore, the lengths of the sides of triangle DEF must be 12, 6, and 6 times (square root 3). Of the choices given, only 6 times (square root 3) is one of these values.
