Mario's friend Omar invites him to a party with some people Mario does not know. Mario suspects that people will use drugs at the party. Which is the best strategy for Mario to maintain his own health in this situation? A. Tell Omar that his parents don't allow him to go to parties so he won't hurt Omar's feelings. B. Go to the party with Omar because he is a good friend and friends should trust friends. C. Ask Omar for more information about the party and decide whether to go based on his answers. D. Tell Omar that he will go to the party, but call him at the last minute and say that something else came up.