Calgary,Canada Is at a Latitude of 51

Multiple Choice

Calgary,Canada is at a latitude of 51.0 degrees north.If one were to travel due south on the Earth's surface from Calgary,what distance would one have to cover to reach the equator.(The radius of the earth is 6370 km)

A) 3310 km
B) 4340 km
C) 5490 km
D) 5670 km
E) 10,020 km