Which statement proves that quadrilateral JKLM is a kite?

A kite has two pairs of adjacent sides that are equal in length. Choice B gives LM = JM = 3 and JK = LK = √17, so each pair of neighboring sides is congruent. The other choices describe angles, a midpoint, or perpendicular diagonals, which do not by themselves prove a quadrilateral is a kite.

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