Greg,a Canadian Citizen,works in the United States but Lives with His

Greg,a Canadian citizen,works in the United States but lives with his family in Canada.How does his employment impact GDP and GNP?

A) He raises Canadian GDP because he spends part of his income in Canada.
B) He lowers U.S.GDP because he takes his income out of the U.S.
C) He raises Canadian GNP because he earns income abroad.
D) He lowers Canadian GNP because he earns income abroad.