A bearing of a line is also known as

ANS:B - true bearing

Yes, the correct answer is B, because the instrument which we have to measure the bearings are magnetic/prismatic compass nt true meridian or something else. Because, if angle of bearing is magnetic bearing, then it's vairry according to time due to change of declination, in this question only mention that angle of bearing, not measured angle of bearing. Magnetic bearing is right, A bearing of a line is called magnetic bearing. It is a horizontal angle measured with magnetic meridian. True bearing is measured from true meridian (true north and true south).
And magnetic bearing measured from magnetic Meridien (magnetic north and magnetic south).
Azimuth is another name of bearing. True bearing is correct because any line is a magnetic meridian and azimuth and reduced bearing but we correct the magnetic bearing by add &subt. Declination angle then found true bearing calculation so bearing of any line is also known as 'true bearing'. A true bearing to a point is the angle measured in degree in a clockwise direction from the North line. This can simply be referred as the bearing. So true bearing is absolutely correct.