[单选题]
How long will it take ,zhdv rbd t8vh7 1jcvnr1qo14do3 g :3a :; mmgqf7+9vi 1evr af1 rtp*ix1w 1xje1bz)c $4.5 \; Ci$ sample of material to reach an activity level of $0.14 \; Ci$ if the half-life is 435 years?
A. $14,478 \; years$
B. $3245 \; years$
C. $2178 \; years$
D. $1993 \; years$
