Question ID:PT60 S2 Q13 Passage:Over the course of one day, a landscaper will use a truck to haul exactly seven loads‚ three loads of mulch and four loads of stone. The truck's cargo bed will be cleaned in between carrying any two loads of different materials. To meet the landscaper's needs as efficiently as possible, the following constraints apply:The cargo bed cannot be cleaned more than three times.The fifth load must be mulch. Stem:Which one of the following is a pair of loads that can both be mulch? Correct Answer Choice:EChoice A:the first and the third Choice B:the second and the third Choice C:the second and the sixth Choice D:the third and the sixth Choice E:the fourth and the sixth