Under a rule of reason approach, which of the following would be legal in the United States? O a. The merger of Taqueria and Mexican Bistro, independent restaurants in the unconcentrated sit-down restaurant market. b. Kellogg's and General Mills colluding to drive Quaker Oats out of business. c. Price fixing between IBM and Compaq. O d. Ford and General Motors electing the same person to their board of directors