Embargoes, quotas, and standards are tools that countries use

- To restrict imports.

Explanation:

The embargo is referred to as an 'official ban' on commercial activity or trade with a particular country while quotas set the restrictions(partial) to restrict the import of goods to a specified quantity. Standards are the imposed conducts pertaining to specified standards that again limit the imports from other countries by neglecting the non-standard goods. Thus, Embargoes, quotas, and standards could be illustrated as the tools to restrict the imports from other countries which are usually done to protect domestic trade or due to political reasons. Thus, the answer is 'to restrict imports'.

d should be removed as it shows bias