Honda 's HR-V, based on the subcompact Fit, has sold over 20,000 copies in the U.S. after just a few months on the market, while General Motors ' ( NYSE:GM ) similarly sized Chevy Trax and Buick Encore have together sold about 70,000 so far in the U.S. in 2015.
In the context of the input sentence, determine the relationship between 'Buick' and 'General Motors'.
Options: parent organization, brand, owned by, manufacturer