Kirana buys boxes of crackers that each has the same cost x. She represents the cost of 2 boxes of cheese crackers, 4 boxes of poppy seed crackers, and 4 boxes of plain crackers using the expression 2x+4x+4x. What equivalent expression can represent the cost?
A. 11x
B. (2+4)4x
C. 2•4•4•x
D. 10x