The velocity of a particle of mass m of de-Broglie wavelength λ is______________?

The velocity of a particle of mass m of de-Broglie wavelength λ is______________?

A. v = 3 ×× 106 ms-1
B. v = 2 ×× 10 ms-1
C. v = 2 ×× 6 ms-1
D. v = 2 ×× 106 ms-1