Concept:A ports authority manages port facilities and provides services to handle cargo and ships.
Explanation:The ports authority offers temporary storage and warehousing accommodation for cargo.
This helps keep goods safe until they are cleared by importers or customs.
Checking smugglers, collecting import duties, and maintaining law and order are functions of customs and other security agencies, not the ports authority.
Therefore, the correct function of the ports authority is providing warehousing services.
Answer:D. providing warehousing services.