Here is a picture, and you can see the melody voice has a rest for the last 8th note, but I also added a rest for the alto and tenor. Is this correct, or would one rest have been ok?
If it is important to show the individual voices, give each voice a rest. For instance, most editors would notate a Bach fugue like this:
In general keyboard writing, not strict polyphony, one rest, centred between the two voices, is fine.
If this WAS four-voice writing (with divisi alto?) and the tenor voice was tacet at this point, A would be correct, with the bass voice stems-down and a rest in the tenor. But for 'keyboard style' the bass notes should follow normal stem direction rules (B).