Jackie, a Canadian citizen, works only in the United States. The value of the output she produces is
选项：

A:included in both U.S. GDP and U.S. GNP.;
B:included in U.S. GDP, but it is not included in U.S. GNP.;
C:included in U.S. GNP, but it is not included in U.S. GDP.;
D:included in neither U.S. GDP nor U.S. GNP.