Utilize the input text as a context reference, choose the right relationship between 'Buick' and 'General Motors' from the options.
Options: business division, employer, owned by, chairperson

General Motors also plans to shift the production of most other Buick models, except the mid-sized LaCrosse sedan and the large Enclave crossover, to China or Europe soon (read more: General Motors to Sell China-made Buicks in US).
owned by