PLEASE HELP!! What is the upper and lower quartile of this set of data? 15, 19, 20, 25, 31, 38, 41 A.lower quartile: 19 upper quartile: 25 B.lower quartile: 25 upper quartile: 38 C.lower quartile: 19 upper quartile: 38 D. lower quartile: 15 upper quartile: 41