Where is the Neutral Bus in this picture of my breaker box?
If that is your main panel both the neutral and the ground can go to the left. It looks like both A &amp;B are isolated from ground (the metal case) .
But if this is a sub panel the neutral goes on the isolated left buss and the ground goes on the right (they should be isolated)
I believe that  rule came  out in the 99 code change so if your home was built prior to this,  and this is a sub it would have been ok back then for a sub to have both on the same buss, today’s code or since 99 a sub  the neutral is isolated from the ground.