210.4 (B)-- This is a common misconception. I've had many discussions on it. The KEY: Common "DISCONNECT"- not trip. Once this is pointed out I get the ole'..."Ohhh-Ya".
As far as "D", I still group a single conduit, For "Justin".. Just in case some one adds ckts to it. How many times have you seen a pipe added to a disco,because it's closer,then conductors added to the original pipe?