What was the unofficial policy adopted by the British government to relax the enforcement of laws meant to maintain control over the American colonies?

Nullification Resolution

Salutary neglect

Proclamation of Neutrality

Intolerable suffrage

Salutary neglect is the right answer.

Salutary was a policy that the British crown used to avoid strict implementation of legislative laws in order to keep the colonies loyal to England. Through this policy, the British Crown relaxed supervision of domestic colonial affairs by royal officials provided significantly to the rise of American self-government. They believed that "if no limitations were installed on the colonies, they would prosper". Hence, they adopted an unofficial policy for this purpose known as the salutary neglect.