[单选题]
An electron is traveling at 0.85c8xvegbp f /i0q;e,lge9y- (y g. What is its m7hzwzpiw 4hezzt :qj ( -,p49qass? (The rest mass is $9.11 \times 10^{-31} \; kg$.)
A. $1.4 \times 10^{-29} \; kg$
B. $7.2 \times 10^{-30} \; kg$
C. $1.7 \times 10^{-30} \; kg$
D. $2.4 \times 10^{-30} \; kg$
