Which of the following scenarios could be represented by the expression 12x + 7y?
A. The total weight of a box containing x 7-ounce packages of
almonds and y 12-ounce packages of peanuts.
B. The number of kids in a school class if there are 12 girls and 7
boys.
C. The total number of marbles in a jar if there are 7 green and 12
red.
D. The cost for x adults and y children to go to the movies if adult
tickets are $12 and child tickets are $7.