Answer: Option B $$\eqalign{
& {\text{ = }}\, - 7m - \left[ {3n - \left\{ {8m - \left( {4n - 10m} \right)} \right\}} \right]\,\,\, \cr
& = \, - 7m - \left[ {3n - \left\{ {8m - 4n + 10m} \right\}} \right]\, \cr
& = - 7m - \left[ {3n - 18m + 4n} \right] \cr
& = - 7m - \left[ {7n - 18m} \right] \cr
& = - 7m - 7n + 18m\,\,\, \cr
& = \,11m - 7n\,\, \cr} $$
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