If the Audience-Mic Signals Are Delayed Relative to the Onstage-Mic

If the audience-mic signals are delayed relative to the onstage-mic signals, ____________.

A) do nothing; that is normal.
B) add an echo to the on-stage mic tracks similar to what the audience mics are picking up.
C) time-slide the audience mic tracks
D) insert a delay in the audience mics.