An imaginary line on the Earth's surface connecting points where the magnetic declination is zero as of a given date is a:

An imaginary line on the Earth's surface connecting points where the magnetic declination is zero as of a given date is a:

An imaginary line on the Earth's surface connecting points where the magnetic declination is zero as of a given date is a: 









A. contour line.
B. declination line.
C. agonic line.
D. grid north line.









Answer: C