On 13 November 1981 you observe a back sight of the lower limb of the Moon as seen through the sextant's scope. The sextant altitude (hs) is 110°31.2'. The height of eye is 46 feet and the index error is 2.0' on the arc. The horizontal parallax is 61.3'. What is the observed altitude (Ho)?

A
70°11.8'
B
69°41.8'
C
69°25.6'
D
69°18.4'
E