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What is the problem with a single operational differential amplifier with active load?

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What is the problem with a single operational differential amplifier with active load?

(a) High input resistance

(b) Low input resistance

(c) Low output resistance

(d) High output resistance

This question was addressed to me during an online exam.

The doubt is from Differential Amplifier with Active Load in section Differential and Multistage Amplifiers of Electronic Devices & Circuits

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The correct option is (b) Low input resistance

The explanation is: The problem with a single operational differential amplifier with active load is its low input resistance. This low input resistance results in a loss of a major component of the signal. Operational Amplifier is internally a Differential amplifier with active load with features like High Input Impedance, Low Output Impedance.

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