Caveat!: A could Pulse Wave any of them.

Caveat to the caveat: Only if an opposing character is in the area of effect.

Caveat to the caveat to the caveat: It'll all be moot when the new rules go into effect as MC will no longer allow Pulse Wave.

GAH!! New rules!!! Thank you Harpua.

because "NOTHING STOPS THE JUGGERNAUT!"

...well.... maybe some specifically worded game rules but otherwise NOTHING! well... he could just get bored and decide to stop and then Nothi... no wait, some weird old rock power from Hulk's son may also prevent a forward motion but outside of that, this guy is going places!

To add to that caveat (I'll let you choose which), the new rules will make a MCed character a part of your force only while being given the move/attack, so in the original example. A, B, C , and D will all be able to attack each other (the down side being that if they are adjacent, they need to break away to move).