A housekeeper leaves home to visit his customers. He drives 4 kilometres east, 1 kilometre south, 7 kilometres west, 5 kilometres north, and 4 kilometres south. How far and in which direction must the housekeeper go to get back to his home?

Question

( A ) 3 km south
( B ) 3 km east
( C ) 3 km west
( D ) 3 km north