The answer is C. As new colonists and explorers discovered the Americas, they also brought disease. This heavily impacted the American Indians as a majority of their population suffered from epidemics.
Enron's complex financial statements were confusing to shareholders and analysts. Its complex business model and unethical practices required that the company use limitations to misrepresents earnings and modify the balance sheet to indicate favorable performance. the combination of these issues later resulted to bankruptcy.
The sugar act helped make America pay for the French and Indian war which was flights on their territory.