What was the most important result of da gamas exploration

Which of the following statements is true about germany's use of u-boats?

Germany italy and japan formed the tripartite pact in part because they: a. hoped to convince the united states to stay out of world war ii b. share the ruling philosophies based on communist economics c. resented the agreements they were forced to sign at the munich conference d. believed their territories were threatened by aggressive foreign states

Plz i will give use examples from the lessons and your own personal experiences to compose at least one well-developed paragraph on the following: define the term reserved powers, and give an example of a reserved power of government.