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: Selena has two types of records, worth a total of \$41.75. Of her 25 records, b records are worth \$1.25 each and the remaining d records are worth \$2.30 each. Selena has no other types of records . Which of the following sets of equations can be solved to determine how many of each record type Selena has?
(A)\(b + d = 4l.75 3.55(b + d) = 25\) (B)\(3.55 (b + d) = 41.75 l.25(b + d) = 2.30\) (C)\(3.55(b + d) = 41.75 1.25b + 2.30d = 25\) (D)\(b + d = 25 2.30b + 1.25d = 41.75\) (E)\(b + d = 25 1.25b + 2.30d = 41.75\)
Example Output: E

Example Input: A school's honor society has 100 members: 40 boys and 60 girls, of whom 30 are juniors and 70 are seniors. What is the smallest possible number of senior boys in the society?
(A)0 (B)5 (C)10 (D)15 (E)20
Example Output: C

Example Input: While biking on a 50-mile path, Jerry averages 5 miles per hour for the first h hours. In terms of h, where \(h < 10\), how many miles remain to be traveled?
(A)\(\frac{50}{5h}\) (B)\(50 - 5h\) (C)250h (D)\(50 - \frac{5}{h}\) (E)\(5h - 50\)
Example Output:
B

