Which of the following technologies most directly caused the treaty above to be signed?

(A) Gunpowder weapons (B) The compass (C) Steel (D) Germ TheoryExplanation: The Treaty of Tordesillas principally involved negotiations over exploration, so eliminate technologies that did not help European navigation—namely (A), (C), and (D). Choice (B), the compass, is the only choice that is related to exploration, so it is the best answer.