Lines of latitude, also called parallels,

Arun in an east and west direction and measure distance north and south of the equator.
Brun in an east and west direction and measure distance north and south of the prime meridian.
Crun in a north and south direction and measure distance east and west of the equator.
Drun in a north and south direction and measure distance east and west of the prime meridian.

Verified Answer :

Lines of latitude, also called parallels, "a. run in an east and west direction and measure distance north and south of the equator", while lines of longitude run North and South. 

The answer is A= run in an east and west direction and measure distance north and south of the equator