Question

which line is at 0° longitude? a. equator b. prime meridian c. north pole d. south pole

Explanation:

The Equator is 0° latitude, while the North and South Poles are 90° north and south latitude respectively. The Prime Meridian is defined as the line of 0° longitude, serving as the reference for measuring east-west positions on Earth.

Answer:

B. Prime Meridian