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What is the purpose of using a differential amplifier with active load?

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What is the purpose of using a differential amplifier with active load?

(a) Increase voltage gain

(b) Decrease voltage gain

(c) Increase current gain

(d) Decrease current gain

This question was posed to me in an international level competition.

My question is from Differential Amplifier with Active Load in division Differential and Multistage Amplifiers of Electronic Devices & Circuits

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The correct option is (a) Increase voltage gain

For explanation I would say: A circuit having a single transistor configuration does not provide suitable bandwidth or gain. The purpose of a differential amplifier with active load is to provide an increase in the voltage gain. The total gain of a differential amplifier with active load is the product of the voltage gains of the discrete stages.

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