If a 755 Nm Photon Travels in a Vacuum, What

If a 755 nm photon travels in a vacuum, what is its frequency of this photon? Recall: the speed of light in a vacuum is 3.00 × 10⁸ m/s.

A) 3.97 × 10¹⁴ s ^{− 1}
B) 9.17 × 10¹³ s ^{− 1}
C) 3.97 × 10¹⁶ s ^{− 1}
D) 2.52 × 10 ^{− 15} s ^{− 1}