Answer: C. Non sequitur.
Step-by-step explanation: non sequitur is a logical fallacy where the reasoning is wrong from because it doesn't follow any kind of logic pattern. The given sentence is an example of the non sequitur logical fallacy because the first premise ( All classes at our school should start at 6 in the morning) doesn't have anything to do with the "consequence" or second premise (if we want the chess team to go to the regional championship) making the whole sentence illogical.