The staff reading at a distance of 80 m from a level with the bubble at its centre is 1.31 m. When
the bubble is moved by 5 divisions out of the centre, the reading is 1.39 m. The angular value of
the one division of the bubble, is
(A) 28.8 sec
(B) 41.25 sec
(C) 14.52 sec
(D) 25.05