A block of mass \( m \) is kept on a platform which starts from rest with constant acceleration ...

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A block of mass \( m \) is kept on a platform which starts from rest with constant acceleration \( \mathrm{g} / 2 \) upward, as shown in figure. Work done by normal reaction on block in time \( t \) is
[JEE (Main) 2019]
(a) \( \frac{m g^{2} t^{2}}{8} \)
(b) 0
(c) \( -\frac{m g^{2} t^{2}}{8} \)
(d) \( \frac{3 m g^{2} t^{2}}{8} \)
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