multiple homeruns for neutral only?
Here is the deal:

No matter how you wire things, you normally need to have two wires. One with the outgoing current and one with the return current. Otherwise you will get inductive heating of any ferrous materials.

If you split a neutral (return the outgoing current back to the source in a separate conduit) you will get inductive heating.

So, to answer your question, the neutral at point A may or may not be joined. This is a fielder's choice since all of the current leaving the panel on the black wire is returning on the two neutrals so the net current (algebraic sum of the current) in the conduit from the panel to point A is zero. However, it is bad technique to have more than one neutral return to the panel per phase conductor. It could be confusing to a future electrician.

This is the key: The algebraic sum of current at any point in the system must add to zero to avoid inductive heating.

Good luck and stay safe!