A small rectangular package has an area of 9x square units and a height of 5 units. A large rectangular package has an area of 6 square units more and a height of 3x units more than the small box. Which of the following equations could be used to determine the volume of the large rectangular box? A. y=(27x2+63x+30)cubic units B. y=（27x2+30)cubic units C. y=(15x2+8)cubic units D. y=(12x2+23x+11)cubic units