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If sum(k = 1)^(n) k (k + 1)(k - 1) = pn^...

If `sum_(k = 1)^(n) k (k + 1)(k - 1) = pn^(4) + qn^(3) + tn^(2) + sn` where `p, q, t` and `s` are constants, then the value of `s` is equal to

A

`-1/4`

B

`-1/2`

C

`1/2`

D

`1/4`

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The correct Answer is:
B
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