Which of the following began this chain of events? A. Hunting and gathering plants for food
B. The invention of the sail boat
C. Fighting wars using metal weapons
D. domestication of plants and animals

2points which option best completes the diagram? humanitarian aid as a tool of foreign policy the united states provides humanitarian aid to rebuild after an earthquake. the country supports u.s. interests. o a. more educated citizens are more likely to create a democratic government o b. the citizens and government have a positive attitude toward the united states. o c. more prosperous citizens have money to spend. o d. the country's government discovers a new natural resource.