An amplifier is required in the process of detection of a signal because:

Transmitted signal is very weak.

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Received signal is very weak.

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Received signal has a lot of noise.

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The output signal from the detector is very weak.

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Solution

The correct option is D Received signal is very weak.
When a transmitted signal propagates in a medium, there is a loss in the strength of signal, called attenuation. Due to this attenuation, the strength of signal decreases appreciably, and a weak signal is received by receiver. Now the signal can't be reproduced efficiently. To compensate for the loss of strength, amplification is required.

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