It's actually D (imo). B doesn't seem to be true for the question and if was, it isn't the most important reason for registering a product. Updates to the newer versions of the programs is more important than support and offers. And not every company product gives technical support if you buy their product, but most will keep providing patches/updates till' the product is dead.
Usually programs do offer newer program upgrades but stop after a certain period e.g. 30 days. That's why they provided both C & D. Copyright laws have not been breached signifies that the program has been bought so you're receiving legit updates.
But then again next time you should post without the correct answer, it makes a difference y'know
EDIT: Is this a one of the online HSC practice questions?