AMC 8 2015 Problem 18

An arithmetic sequence is a sequence in which each term after the first is obtained by adding a constant to the previous term. For example, $2,5,8,11,14$ is an arithmetic sequence with five terms, in which the first term is $2$ and the constant added is $3$. Each row and each column in this $5\times5$ array is an arithmetic sequence with five terms. The square in the center is labelled $X$ as shown. What is the value of $X$? $\textbf{(A) }21 \textbf{(B) }31 \textbf{(C) }36 \textbf{(D) }40 \textbf{(E) }42$