2017 AMC 8 Problem 6

If the degree measures of the angles of a triangle are in the ratio 3:3:4, what is the degree measure of the largest angle of the triangle?

\textbf{(A) }18\qquad\textbf{(B) }36\qquad\textbf{(C) }60\qquad\textbf{(D) }72\qquad\textbf{(E) }90

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