So,
There's an equation that we could use in order to find frequency, and it is the next one:
This equation tells us that the energy of the photon is equal to the product of the Plank constant (h), which is 6.626*10^-34 J.s, and the frequency.
In this problem, we know the value of E and the value of h, so we need to solve for v:
Therefore, the correct answer option is A.
