I'm looking into online 9 week course and the two classes that are best with my schedule are led by either James Brock or Brian Birdwell - I'd love to hear any feedback that anyone has had from a class from either of these two gentlemen. Thanks!

does GMAT consider 0 multiple of every number?

Perhaps when referring to "units digit," we are to assume that it is a positive number. Or maybe MGMAT just made that assumption. It could just be one of the quirks of the GMAT that we have to learn. Stupid test!...lol

Why not C? If the plan is to educate people, but the media is already advertising to them about unhealthful snacks, then the plan won't be successful because media influence. Any advice would be nice...?

No do not retake the GMAT you would be wasting your time. A better score will do nothing to get you in. Focus on the rest of your application your score is terrific. Good luck