A b or c
the world may never know

a

Explanation:

The next clause is a main clause, so we would signify that with a semi-colon, as opposed to adding another subordinate clause which is signified by a comma.

the central idea is basically saying that juveniles that have committed a crime will not have the same consequences as the   adults that have. they will have a softer punishment than what the adults have that is harsh in some ways.