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The input impedance of the base increases when ______

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The input impedance of the base increases when ______

(a) Beta increases

(b) Supply voltage increases

(c) Beta decreases

(d) AC collector resistance increases.

I got this question in quiz.

My doubt is from Voltage Amplifiers topic in division Differential and Multistage Amplifiers of Electronic Devices & Circuits

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Right choice is (a) Beta increases

Explanation: Input impedance of the base is given as   = beta * rE.

Therefore, beta(gain ratio) is directly proportional input impedance of the base.

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