d
\({{\rm{A}}_{\rm{C}}}\,\, = \,\, - \left( {\frac{{{h_{fe}}}}{{1\,\, + \;\,{h_{oe}}{R_L}}}} \right)\,\,\, = \,\, - \,\,\left( {\frac{{50}}{{1\,\, + \;25\,\, \times \,{{10}^{ - 6}}\,\, \times \,\,\left( {{{10}^3}} \right)}}} \right)\,\, = \,\, - 48.78\)