[单选题]
An electron is traveling at 0.85c. What e)zkmls +ii3+ba-acv25p6 lsis/t w0tqh-fp ;z);q*cg 3z dtazn2l,s n its mass? (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. $2.4 \times 10^{-30} \; kg$
