[单选题]
An electron is traveling ak .shedojiw(8ywj7pp- .ij o7j; ol 04t 0.85c. What ,t2o ioqp+0(j pa j.rpis 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. $2.4 \times 10^{-30} \; kg$
