A body starts from rest and moves for \( n \) seconds with uniform acceleration \( a \), its vel...

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A body starts from rest and moves for \( n \) seconds with uniform acceleration \( a \), its velocity after \( n \) seconds is \( v \). The displacement of the body in last 3 seconds is :
(A) \( \frac{v(6 n-9)}{2 n} \)
(B) \( \frac{2 v(6 n-9)}{n} \)
(C) \( \frac{2 v(2 n+1)}{n} \)
(D) \( \frac{2 v(n-1)}{n} \)
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