[单选题]
The mass of an electro)i incd20v*g v294t5g qfm clgi.jda+a9x.fdn is) tzog o5soo(xk ayd+,pa:+-x $9.1 \times 10^{-31} \; kg$. How many electrons will make a mass of 1.0 kg?
A. $9.1 \times 10^{30}$
B. $1.1 \times 10^{30}$
C. $9.1 \times 10^{31}$
D. $1.1 \times 10^{31}$
