E4D09:What is the purpose of the preselector in a communications receiver?

Direct answer summary (2024-2028 NCVEC pool)

The official correct answer for E4D09 is To increase the rejection of signals outside the band being received.

The key fact is To increase the rejection of signals outside the band being received. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.