AMC 8 2019 Problem 11

The eighth grade class at Lincoln Middle School has $93$ students. Each student takes a math class or a foreign language class or both. There are $70$ eighth graders taking a math class, and there are $54$ eighth graders taking a foreign language class. How many eighth graders take only a math class and not a foreign language class? $\textbf{(A) }16 \textbf{(B) }53 \textbf{(C) }31 \textbf{(D) }39 \textbf{(E) }70$