According to the Trade Balance, the "+" Sign Refers to _____

According to the trade balance, the "+" sign refers to _____ and the "-" sign refers to _____.

A) when foreigners use services in a country; when foreign services are used
B) when foreign services are used; when foreign services are used
C) incoming dollars coming in when merchandise is exported; dollars that leave the country to pay for imports
D) merchandise imports; incoming dollars
E) earnings from overseas investment; payments are sent overseas