[单选题]
X-rays with a wavele2qkw ek foo:0 m1kh;s-ngth of 0.00100 6kw)jtr lpy1a..hv c4nm are scattered by free electrons at 130e. What is the kinetic energy of eahwjvy k)6l. .ta r4cp1ch recoil electron?
A. $2.5 \; MeV$
B. $5.0 \; MeV$
C. $7.5 \; MeV$
D. $10 \; MeV$