In formation of an island, the owner of the nearest margin/distance is the owner of the new island?

Because of the principle that accessory follows the principal.

Because of the express provision of laws.

Only if the river is floatable or navigable.

Only if the river is non-floatable or non-navigable.

In formation of an island, the owner of the nearest margin/distance is

1.	In formation of an island, the owner of the nearest margin/distance is the owner of the new island?
A.	Because of the principle that accessory follows the principal.
B.	Because of the express provision of laws.
C.	Only if the river is floatable or navigable.
D.	Only if the river is non-floatable or non-navigable.
Answer» E.