The explanation that best explains why the end of salutary neglect made the American colonies angry is: The colonies had gotten used to being able to trade with whomever they wanted and paying lower taxes.
During the period of salutary neglect, the British government largely ignored the enforcement of trade regulations, allowing the colonies a degree of economic freedom and the ability to engage in profitable trade with various partners. When Britain decided to enforce stricter regulations and taxes following the French and Indian War, the colonies resented this abrupt change in policy, as it curtailed their economic independence and imposed new financial burdens.