Millie buys 10 cartons of ice cream at a grocery store for $37.90. Each carton of ice cream cost the same amount. Which equation represents the proportional relationship between y, the total cost of the ice cream, and x, the number of cartons? * A. 3.79 x = y B. 3.79/x = 10/y C. 37.90x = y O D. 37.90x = y