【单选题】What was the main objection raised by those in the United States and Canada who opposed the ratification of the NAFTA? 美国和加拿大反对批准北美自由贸易协定的人提出的主要反对意见是什么?
A.
Job losses失业
B.
Balance of payment problems国际收支问题
C.
Threat of competition from Asian companies来自亚洲公司的竞争威胁