I don't know what "this" means here - but Spain, England and Portugal based their empires on their sea explorations and colonizations - all their colonies were not reachable (or only by de-tours) by land.
China, on the other hand was not based on Islands, but connected by land: so here China is the best option.
It should be D, since the document in question has a person included themselves in the event.
Answer:
Theodore Rosevelt
Explanation:
I did the edpuzzle and theodore rosevelt was the only major influencer around that time period.
