Lines of latitude a. are parallel to each other b. converge at the poles c. are measured north or south of the prime meridian

correct fill up option are a. are parallel to each other

Explanation:

here lines of latitude are parallel to each other

because as we know earth is sphere that mean it is bulging at the equator and getting reduced towards the poles

so latitudes are parallel lines of circle that is distributed toward north and south of equator

so all the latitudes is parallel to each other that's why they can never converge

and we measure longitude with respect to prime meridian

and we measure latitude with respect to the equator

so here correct fill up option are a. are parallel to each other