The 'fix' of a plane table station with three known points, is bad if the plane table station lies

ANS:C - on the circumference of the circumscribing circle

The correct answer should be 'B', cause when instrument point "nearer to the circumference" of great circle then fix is bad. And when it is "on the circumference" of the great triangle instrument point will be indeterminate. We draw lines to the three points and draw circle joining these three points.

So if the station is on the circumference then it maybe difficult to calculate area and degree.