You are given a mathematical question described with a circumscribed mathematical vocabulary. Questions in this task usually contain some variables (e.g. X, Y), equations (e.g. X+Y=3) and some relationships (X is greater than Y). Often you need to find the value of the variable using equations and relationships. 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.

Ex Input:
\begin { gather* } -7, -5, -3, -1, 0, 1, 3, 5, 7 \end { gather* } How many distinct products can be obtained by multiplying pairs of numbers from the list above?
(A)9 (B)17 (C)19 (D)21 (E)31

Ex Output:
B


Ex Input:
If \( |k-5| \leq 8 \), which of the following CANNOT be the value of \(k\) ?
(A)10 (B)8 (C)5 (D)-3 (E)-4

Ex Output:
E


Ex Input:
\begin { gather* } a, ar, ar^2, ar^3,...\end { gather* } In the sequence above, the first term is \(a\) and each term after the first is obtained by multiplying the preceding term by \(r\). If the third and fifth terms in sequence are 2 and 8, what is the value of the 7th term?
(A)16 (B)24 (C)32 (D)48 (E)96

Ex Output:

C