A transistor is operated in common emitter configuration at \[{{V}_{C}}=2V\] such that a change in the base current from \[100\,\mu A\] to \[300\,\mu A\] produces a change in the collector current from \[10\,mA\] to\[20\,mA\]. The current gain is

• A. \[50\]
• B. \[75\]
• C. \[100\]
• D. \[25\]