An engineering company needs to solve a design problem. It is designing a high-speed train to transport passengers between Boston and Atlanta. Which statement is a constraint for this project? A. The train must have a dining car in which meals are served. B. The train must be able to carry at least 300 passengers. C. The train must cost less than $6 billion to build. D. The train must be able to complete the trip in six hours. PLEASE HELP​