The atomic mass unit (1u) is correctly represented by:

The correct answer is Option (2) → $1u=931.5 MeV/C^2$

Energy equivalent of 1u is $931 MeV$ by -

$E=mc^2$ [Special theory of relativity]

$=(1.66×10^{-27})×(3.00×10^8m/s)^2$

$=1.494×10^{-10}J$

and,

$E_{MeV}=\frac{1.494×10^{-10}}{1.602×10^{-13}T/MeV}$

$≃931.5MeV$