If in an A.P., \( \mathrm{S}_{n}=q n^{2} \) and \( \mathrm{S}_{m}=q...

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If in an A.P., \( \mathrm{S}_{n}=q n^{2} \) and \( \mathrm{S}_{m}=q m^{2} \), where \( \mathrm{S}_{r} \) denotes the sum of \( r \) terms of the A.P., then \( S_{q} \) equals
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(A) \( \frac{q^{3}}{2} \)
(B) \( m n q \)
(C) \( q^{3} \)
(D) \( (m+n) q^{2} \)
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