Answer:
Good choice: buys almost all of
Explanation:
The USA is the first trading partner of Canada. It´s the main destination of Canadian exports. In 2018, according to statistics of the USTR, Canada exported good and services to the US for US$ 354.7 billion. To China, its second trade partner, Canada exported US$ 18.4 billion in 2017, according to other sources. It´s easy to see the disproportion.