Polygons PQRST and VWXYZ are similar. If PQ = 4 feet, QR = 11 feet, RS = 3 feet, ST = 9 feet, TP = 7 feet, and XY = 12 feet, then what is the length of WX?

a) 36 feet
b) 28 feet
c) 44 feet
d) 15 feet