[单选题]
99.01: The change of6zosz)r7e zw j3( +kxw di /8vpa7r wtfmvi,0r2 066o 2gnk fzfsrstance per unit time without reference to a particular direction is ca6 i mrw,2rrfgs8zkv/7tfa0on2v60 fp lled
A. inertia
B. speed
C. velocity
D. acceleration
E. position