The central latitudinal line is the and the central longitudinal line is the a. prime meridian; tropic of capricorn c. equator; prime meridian b. prime meridian; equator d. equator; tropic of cancer

Option C, Equator and prime meridian

Explanation:

Latitudinal lines are imaginary lines that run parallel to the East - West direction of earth. These lines depict the position of any place on globe in terms of angle formed to the north and south of the equator. Thus, the central latitude will have zero degree latitude and this central latitude is the equator

While Longitudinal lines are also imaginary lines that run parallel to the North -south  direction of earth. These lines depict the position of any place on globe in terms of angle formed to the East and west  of the prime meridian. Thus, the central longitude  will have zero degree longitude and this central longitude is the prime meridian

thinking it would be d not too sure but i think it's right