Legal's main job here is avoiding trouble with regulators, so A fits best. When a government bans a vendor, using their devices could violate sanctions, which means legal risk and possible fines. Cost (C) or data sovereignty (B) might matter to others but not top priority for general counsel in this scenario. Pretty sure it's A, but open to other takes.
Wouldn't cost of replacement (C) also be a serious concern during hardware refresh? I get that legal would review sanctions, but for most companies budget impact is huge and sometimes general counsel has to sign off when costs skyrocket. Anyone run into this in official practice tests?