A water fountain flows at a steady rate of 500 \mathrm{~mL} every 6 seconds. At this rate, how long will it take to fill a 250 \mathrm{~mL} bottle?
Answer Choices
A. 2 \mathrm{~s}
B. 9 \mathrm{~s}
C. 3 \mathrm{~s}
D. 6 \mathrm{~s}
E. 1 \mathrm{~s}