[单选题]
Suppose that the speed of an electr4 uo+aywgg:) 6wmu;r oon traveling 2000 m/s is j ht6u22 jkfl0known to an accuracy of 1 part i 0 ulthk62fjj2n $10^5$ (i.e., within 0.001%). What is the greatest possible accuracy within which we can determine the position of this electron?
A. $2.9 \; mm$
B. $5.8 \; mm$
C. $8.7 \; mm$
D. $1.2 \; cm$