In 2014, the Buick line sold 919,582 vehicles in the country – almost four times higher than the 228,963 units of Buick sold in the U.S. General Motors believes that its sales volume for Buick in the U.S will not be large enough to justify the establishment of a plant in U.S.
Utilize the input text as a context reference, choose the right relationship between 'Buick' and 'General Motors' from the options.
Options: owned by, platform, location of formation, brand