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.
Refer to the input text as context and select the correct relationship between 'Buick' and 'General Motors' from the available options.
Options: business division, chairperson, owned by, parent organization