On applying a potential of ? 1 volt at the grid of a triode, the following relation between plate voltage Vp (volt) and plate current \[{{I}_{p}}(\text{in }mA)\] is found \[{{I}_{p}}=0.125\,{{V}_{p}}-7.5\]If on applying ? 3 volt potential at grid and 300 V potential at plate, the plate current is found to be 5mA, then amplification factor of the triode is

• A. 100
• B. 50
• C. If assertion is true but reason is false.
• D. 20