2019 AMC 8 Problem 11

The third-grade class at Lincoln Elementary School has 93 students. Each student takes a math class or a foreign language class or both. There are 70 third graders taking a math class, and there are 54 third graders taking a foreign language class. How many third graders take *only* a math class and *not* a foreign language class?

\textbf{(A) }16\qquad\textbf{(B) }23\qquad\textbf{(C) }31\qquad\textbf{(D) }39\qquad\textbf{(E) }70

Full credit goes to MAA for authoring these problems. These problems were taken on the AOPS website.