Last month, company \(X\) sold three-quarters of the widgets it produced, including two-thirds of its curved widgets. If three-fifths of the widgets that it produces each month are curved, what percent of the widgets that were not sold last month were curved?
A. \(60\%\)
B. \(70\%\)
C. \(75\%\)
D. \(80\%\)
E. \(90\%\)
Answer: D
Source: Veritas Prep