123 You observe the lower limb of the Sun at a sextant altitude (hs) of 54°28.2' on 22 July . The index error is 1.5' off the arc. The height of eye is 56 feet (17.1 meters). What is the observed altitude (Ho)?

A. 54°30.9'
B. 54°36.2'
C. 54°37.7'
D. 54°37.9'