On 23 August 1981 you observe a back sight of the upper limb of the Sun as seen through the sextant's scope. The sextant altitude (hs) is 116°42.8'. The height of eye is 56 feet and the index error is 2.0' on the arc. What is the observed altitude (Ho)?

A
63°42.0'
B
63°38.0'
C
63°19.4'
D
62°49.6'
E