Which was a major cause of enviromental pollution in American cities during the late 1800

Which of these statements best describes the ambiguity in this excerpt

What is the acronym to remember when evaluating source information?

Who were the sons of liberty? a. colonists who wanted a monopoly on the british tea trade. b. colonial anti-british protestors c. colonists who wanted seats in the british parliament. d. colonists who wanted to block all colonial trade with britain. !