Can someone elaborate on the definition of the Portuguese Malacca war?

Malacca was one of the three key-points with Goa and Hormuz, which gave Portugal the control over the main Asiatic trade routes. After the conquest Albuquerque immediately ordered the building of a fortress on the south side of the river. This fortress was called “A Famosa” and it was finished in November 1511.

Explanation:

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.

your answer would be (b)