想请教大大一题物理，
因为看不懂题意，卡关好久，GOOGLE大神也只帮忙找到付费网站的解答@@
拜托各位大大了！
题目如下：
A car is 200 m from a stop sign and traveling toward the sign at 40.0 m/s.
At this time, the driver suddenly realizes that she must stop the car.
If it takes 0.200 s for the driver to apply the brakes,
what must be the magnitude of the constant acceleration of the car after
the brakes are applied so that the car will come to rest at the stop sign?
只能选择一个：
a. 2.08 m/s^2
b. 4.17 m/s^2
c. 3.42 m/s^2
d. 3.89 m/s^2
e. 2.89 m/s^2