If a U.S. citizen buys a television made in Korea by a Korean firm, then

A、U.S. net exports decrease and U.S. GDP decreases.;

B、U.S. net exports are unaffected and U.S. GDP decreases.;

C、U.S. net exports are unaffected and U.S. GDP is unaffected.;

D、U.S. net exports decrease and U.S. GDP is unaffected.