Discussion
To increase level of very weak radio signals from an antenna, you would use :
Answer: C
To raise the level of very weak signals from an antenna you would use an RF amplifier.
The signal at the antenna is at radio frequency and may be only microvolts. An RF amplifier, usually a low-noise amplifier at the front of the receiver, boosts it at its own frequency before the mixer. Because it comes first, its gain and noise figure largely set the sensitivity of the whole receiver, and it also improves image rejection.
Oscillators, RF or audio, generate signals rather than amplifying them; an RF oscillator is the receiver's local oscillator. An audio amplifier works only after detection, at audio frequencies, so it cannot boost the RF signal from the antenna.
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