The correct answer is (c) 40
The explanation is: The total gain of a high frequency response of multistage amplifier can be calculated by the formula given below. Where, AV = overall gain, AV1 = voltage gain of first stage and AV2 = voltage gain of second stage.
Given, AV1 = 4 & AV2 = 10
AV = AV1 × AV2 = 4 × 10 = 40.