若等差数列\(\{a_{n}\}\)的首项\(a_{1}=C_{5m}^{11{-}2m}-A_{11{-}3m}^{2m\mathrm{{-}2}}(m∈N)\)，公差是\((\dfrac{5}{2x}-\dfrac{2}{5}\sqrt[3]{x^{2}})^{n}\)展开式中的常数项，其中\(n\)为\(77^{77}-15\)除以\(19\)的余数，则\(a_{n}\)等于\((\) \()\)
A. \(98-2n\)
B. \(2n+98\) C. \(104-4n\) D. \(25n+75\)
