Question

at what degree of longitude is the prime meridian located? 15 degrees west 90 degrees east zero degrees

Explanation:

The prime meridian is defined as the line of longitude at 0 degrees. It serves as the reference point for measuring longitude, with longitudes east and west measured from this 0 - degree line. The other options (15 degrees West, 90 degrees East) are not the location of the prime meridian.

Answer:

zero degrees