What department handles relations with other nations?
a.) state department b.) war department c.)treasury department d.) foreign department

The Foreign department handles relations with other nations. The correct option among all the options given in the question is option "D". The main purpose of the foreign department is maintaining foreign relations with the different countries around the world. The foreign relations department is also responsible for checking of the Visa’s and allowing people to enter or leave the country. Normally the foreign relations offices are also located in friendly countries. This is a department of very high importance to any country.