Utilize the input text as a context reference, choose the right relationship between Buick and DETROIT from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

DETROIT (Reuters) - Most Buick vehicles sold in the United States after 2016 could be imported from China and Europe, according to two sources familiar with parent General Motors Co's plans.

Answer: headquarters_location