HELP 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?

Select one:

a. Henry built new kinds of ships for the explorers to use.

b. Henry discovered how to avoid diseases common in sailing ships.

c. Henry ran a school of navigation where maps were created.

d. Henry was a patron of explorers and paid for many expeditions.