The correct options are
A Foreign policy is a means of fostering the national interest of a country.
B It helps the government to improve its interactions and relationships with other countries.
C It contributes towards the protection of a country's borders and improvement of its economy.
Foreign policy is a country’s policy regarding its relationship with other nations, participation in blocs and approach towards international relations. It is designed to safeguard and promote the well-being of its population. Its dynamics range from the protection of its borders and improvements of its economy to improving its relationships with other countries.