Hello Noddy! Welcome to ATP
I do not see plants A B or C?
Looking at the variegated Jade, it seems it is looking for more light. The media you have used is not bad. I just usually use the regular cacti soil and add some pumice or more perlite to really make it more fast draining. Jades can tolerate cold temps even up to 32F (0C) as long as kept dry and gets enough light. I grow mine outdoors year round since our winters are milder, no snow, just the erratic rains which is again missing in action here in our area.
In its current form, if you want you can cut just a few inches below each set of leaves, let it dry/callus a bit, then you can stick them again in another similar container with mix of cacti soil-pumice or perlite. It should be fine. In this case, put it in part sun to it can grow new roots. Give it time, it is active growing season now, it likes the cool temps. Some would dip it into some rooting hormone before they stick it in soil again, but I personally do not do that, it will grow the roots eventually. Or you can just leave it alone, maybe in your location it just wants to get a bit warmer, before it resumes growing again, or a little repositioning to a brighter area may help the plant a bit more. South, east or west facing windows will be okay.
Since I do not see plant A B or C, I cannot comment on it.. but typically jades and Portulacaria Afra behave the same when they grow new leaves..sometimes from the center of a rosette of leaves or at any point on each stem node.
Here are some photos:
This is my variegated jade, you can see new leaf growth may form at any available node:
Or at the center of an existing rosette:
This is my Portulacaria Afra..behaves the same:
new leaves at any node
or right at center of existing cluster:
