How Many Photons Per Second Emerge from a Laser of Power

Multiple Choice

How many photons per second emerge from a laser of power 2.00 mW with wavelength 605 nm?
(c = 3.00 × 10⁸ m/s, h = 6.626 × 10^-34 J ∙ s)

A) 6.09 × 10¹⁵ photons/s
B) 5.03 × 10¹² photons/s
C) 3.07 × 10¹⁵ photons/s
D) 3.07 × 10¹³ photons/s