Following staff readings were taken with a level, the instrument having been moved after third and sixth reading 2.200, 1.620, 0.980, 2.250, 2.840, 1.280, 0.600, 1.960, 1.450 If R.L. of first point is 100.000 m, then RL of last point is
A101.350
B101.340
C101.430
D100.340