Question ID:PT60 S2 Q15 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:If the third load is mulch, which one of the following must be true? Correct Answer Choice:EChoice A:The sixth load is a different material than the seventh load. Choice B:The first load is a different material than the second load. Choice C:The seventh load is mulch. Choice D:The sixth load is mulch. Choice E:The first load is stone.