[单选题]
If the scattering angle (w 3g8tw,g:/qh wi4tnz cyr0r in Compton's sc/u /wxqp 1c8hnkhu2 v7attering is 90e. What is the wavelength shif ku n7v/hpx2/u1h8 cwqt?
A. $1.22 \times 10^{-12} \; m$
B. $2.43 \times 10^{-12} \; m$
C. $3.65 \times 10^{-12} \; m$
D. $4.85 \times 10^{-12} \; m$