Question

Henry the Navigator never sailed the seas or traveled from from his home. Yet, this Portuguese Duke had a great impact on exploration during the 15th through 17th centuries. In what way was the Duke influential?

Henry built new kinds of ships for the explorers to use.
Henry ran a school of navigation where maps were created.
Henry discovered how to avoid diseases common in sailing ships.
Henry was a patron of explorers and paid for many expeditions.

Answer 1

Follow the money. He paid for and profited from the exploration. It was long held that Henry had a school and such. There is no evidence of this.
If your teacher insists that B is correct they are ill informed.

Answer 2

so would it be D?

Answer 3

yup. looks like that to me.