You are given a mathematical question described with an open-ended vocabulary. Questions in this task involve real-world situations, describing a mathematical problem. You are also given 4 or 5 answer options (associated with "A", "B", "C", "D", "E"). Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D', 'E'. LaTeX mathematical format (the standard way to express mathematical expressions in the typesetting software known as LaTeX) is used to express equations. Each question is solvable with high school math knowledge. Give only one answer for each question.

Example Input: When the organizers of a bake sale sell brownies for \$ 1.50 each, they sell 7 brownies every hour. When the brownies are sold for \$2.00 each, 5 brownies are sold each hour. If \(x\) is the price per brownie in dollars, and \(f\) is the number of brownies sold per hour, then which of the following could represent \(f\) as a function of \(x\)?
(A)\(f(x) = 4x + 1\) (B)\(f(x) = 6 x- 7\) (C)\(f(x) = -3x + 11\) (D)\(f(x) = -4x + 13\) (E)\(f(x) = -6x + l6\)
Example Output: D

Example Input: If as many 7-inch pieces of wire as possible are cut from a wire that is 6 feet long, what is the total length of the wire that is left over? (12 inches \(=\) 1 foot)
(A)2 inches (B)3 inches (C)4 inches (D)5 inches (E)8 inches
Example Output: A

Example Input: One box of muffin mix is sufficient to bake six large muffins or ten mini- muffins. How many boxes are needed to bake 180 muffins, 120 of which are large muffins and the rest of which are mini-muffins?
(A)18 (B)20 (C)22 (D)26 (E)28
Example Output:
D