The C=C Stretching Absorption in the IR Spectrum Occurs at About

The C=C stretching absorption in the IR spectrum occurs at about 1650 cm^-1. The C-C stretching vibration occurs but is not observed. Which of these frequencies would be closest to the frequency of the C-C stretching vibration?

A) 3300 cm^-1
B) 815 cm^-1
C) 2330 cm^-1
D) 1165 cm^-1
E) (1650 cm^-1) /2 $\pi$ c, where c is the speed of light.