The elevtion of M is 875 . a transit was set at point M and a leveling rod was held vertically at point N. the horizontal cross line of the telescope was inclined so the reading of the horizontal cross line on the rod was 12 ft. the horizontal distance between the point is 250 ft if the instrument is 5.25 ft above point M and the reading of the vertical limb is 2 degree, the elevation of N is wich one is correct is A873.42 or B880.38 or is C889.83 or is D877.38 wich one is correct?