On 29 June 1981 you observe a back sight of the upper limb of the Moon as seen through the sextant's scope. The sextant altitude (hs) is 114°16.9'. The height of eye is 36 feet and the index error is 2.0' on the arc. The horizontal parallax is 60.5'. What is the observed altitude (Ho)?

A
66°31.6'
B
66°31.0'
C
66°28.8'
D
66°26.0'
E