PART A: What is Columbus’ primary purpose in his letter? A.
To express his desire to learn about the culture and people of the islands he explored.
B.
To display his vast knowledge of oceanic travel and exploration.
C.
To demonstrate his loyalty to the Spanish monarchy and God by claiming the islands in their names.
D.
To illustrate his successes and advantageous discoveries to secure financial support for future voyages.

D. To illustrate his successes and advantageous discoveries to secure financial support for future voyages

Explanation:

Christopher Columbus was sponsored by the Spanish government to conduct an expedition toward the Atlantic ocean. The purpose of this expedition is to find trade routes that Christian Merchants can use to conduct their trades.

He came across a route to American continent in  1492. He wrote his letter for the Spanish government to tell a story about his successful discoveries.

In the letter, he mentioned that he stumbled upon a land with great resources and wealth. He wanted the Spanish government to seize this and reward him for his effort to support his future voyages.

i believe your answer is true

sorry if wrong