If \( \sum_{r=1}^{n} r(r+1) \quad(2 r+3)=a n^{4}+b n^{3}+c n^{2}+d ...

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If \( \sum_{r=1}^{n} r(r+1) \quad(2 r+3)=a n^{4}+b n^{3}+c n^{2}+d n+e \), then
\( \mathrm{P} \)
(A) \( a+c=b+d \)
(B) \( e=0 \)
W
(C) \( a, b-2 / 3, c-1 \) are in A.P.
(D) c/a is an integer
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