Which of the following is an actual, physical line A-ecliptic. B- celestial equator.
C- prime meridian.
D- fault line

The correct answer is D

I'm pretty sure it's c. extremely gradual but not 100% sure though.

Historians are researchers of the past or people who understand the history of people. with this field, they must possess qualities such as being unbiased, patient, efficient reader, has a knack for logic and critical thinking and reasoning, disciplined, open-minded, resourceful, with good analytical ability, good reasoning skills and problem solving!