What Was a Major Factor Motivating Portugal to Take the Lead

What was a major factor motivating Portugal to take the lead in European Atlantic exploration?

A) The Spanish and Muslims controlled the Straits of Gibraltar.
B) Portugal lost its port of Ceuta in 1432.
C) Henry the Navigator,the son of Portugal's king,successfully explored the West African coast.
D) Bartolomeu Dias conducted profitable explorations of the coasts of Iceland.
E) In 1432,the English took control of the Canaries,Azores,and Madeiras.