One of the main functions of R.F. amplifier in a superheterodyne

One of the main functions of R.F. amplifier in a superheterodyne receiver is to—

1. provide better tracking
2. provide excellent adjacent channel selectivity.
3. improve image frequency rejection.
4. increase the tuning range of receiver.

The main function of R.F. amplifier in a superheterodyne receiver is to improve image frequency rejection.