15. 函數 f (t ) 之拉普拉斯轉換(Laplace transform)為 \( \mathcal{L}\{f(t)\} \)，令\( \mathcal{L}\{f(t)\} = \frac{1}{s^2(s-1)} \)則下列何者正確？ 
(A) f (t ) = e ^t - t - 1
(B) f (t ) = - e ^t - t - 1
(C) f (t ) = e ^t + t - 1
(D) f (t ) = - e ^t + t - 1

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