Correct Answer: (b) 1498 A.D.
Solution:Vasco da Gama arrived at western coast poet of Calicut on May 20, 1498 A.D. He discovered a new and alternative sea route to India and he was welcome by zamorin (Zomorin was the ancestral. title of the rulers of Calicut, the then king of Calicut. The voyage of Vasco da Gama opened the new trade dimensions of the Indo-Portuguese alliance. Vasco da Gama o earned 60 times more profit in Europe by black pepper trade from India which encouraged other Portuguese traders. The Portuguese merchants established their commercial firms in India at of Calicut, Goa, Daman, Diu and Hooghly. Francisco de Almeida came to India in 1505 as the first Portuguese Viceroy. The 'Blue Water" policy is attributed to Francisco de Almeida, the first viceroy of Portuguese possessions in India. According to Blue water policy, "The Portuguese should be the sole trade power in the Arabian Sea and the Indian Ocean", Albuquerque came to India in 1509 after him, as new Viceroy. He annexed Goa in 1510 form Bijapur ruler Yusuf Adil Shah. The Portuguese maintained Goa as the epicentre of their culture and entity.