Which is the correct explanation for 40°n latitude? a. all positions along a circle that runs parallel to the equator and 40° south of it b. all positions along a circle that runs perpendicular to the equator and 40° west of it c. all positions along a circle that runs perpendicular to the equator and 40° east of it d. all positions along a circle that runs parallel to the equator and 40° north of it