Q is 12 m east of P. R is 16 m north of Q. How far is P from R, and in which direction is P with respect to R?(Use the eight main directions: a place that is both north and east of another is taken to be north-east of it, and so on.)
A. 20 m, south-east
B. 20 m, north-east
C. 28 m, south-west
D. 20 m, south-west