\( O P Q R \) is a square and \( M, N \) are the mid-points of the sides \( P Q \) and \( Q R \)...

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\( O P Q R \) is a square and \( M, N \) are the mid-points of the sides \( P Q \) and \( Q R \) respectively. If the ratio of the areas of the square and the triangle \( O M N \) is \( k: 6 \), then \( \frac{k}{4} \) is equal to
(a) 2
(b) 4
(c) 12
(d) 16
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