Piyali bought 28.5 meters of cloth. She used 2.5 meters of the cloth to make a shirt and 3/5 of as much as that used for the shirt to make a matching pair of shorts. She sewed 6 shirts and some pairs of shorts for her children. If she had 1.5 meters of cloth left, how many pairs of shorts did she sew ?
(a) 7
(b) 8
(c) 9
(d) 10