What did the Writs of Assistance do?

Answer:
D. Prevent smuggling.
Explanation:
In common, customs writs of assistance worked as common search warrants that did not terminate, providing customs executives to search wherever for hidden goods without having to receive a particular warrant.
Writ of assistance, in English and American colonial history, a universal search warrant published by superior countrified tribunals to assist the British administration in implementing trade and exploration laws.