Prince henry initiated a program of exploration to find a route to the east indies, by sailing around africa asia south america

Prince Henry initiated a program of exploration to find a route to the East Indies, by sailing around Africa.

Explanation:

Portuguese exploration along African coasts was fundamental for finding a route to the West Indies in the 15th century, after the Turks had cut the traditional route to Asia after their conquest of Constantinopole.  In 1498, Vasco da Gama finally managed to circumnavigate Africa and arrived in India. The main goal of the Portuguese was to trade spices with India.

7.03-1.70=5.33 and 6.80+5.09=11.89 and 5.5-3.01=2.49

the answer is b. apsidal precession