In a Compton scattering experiment, an x$-$ray

with a wavelength of $0\mathrm{.}63$ pm is shone on a thin

carbon foil. After the collision with an electron,

the wavelength increases by $25\%.$ The angle

of deflection $($with respect to the original

direction of the incident x$-$ray$)$ is

A$.$

B$.$

C$.$

D

$21\backslash$deg

$36\backslash$deg

$54\backslash$deg

$69\backslash$deg