You will be given a definition of a task first, then some input of the task.
In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".

[header] How to get through a dui checkpoint [title] Avoid the checkpoint if possible. [step] You aren't legally required to go through a checkpoint if you see one up ahead. Instead, you can pull onto a side road or do a u-turn, if legal. <sep> (A) Otherwise, you can drive behind the vehicle to a safe spot. [title] Give the driver behind you a thumbs-up. (B) You shouldn't jeopardize the drive if there is an obstruction, for example. [substeps] If you drive with an obstruction in mind, always call emergency services or even 911. (C) [substeps] There's no need to pull over until you do see a checkpoint. Instead, stop at a green light or stop early. (D) [substeps] Don't break the law to avoid the checkpoint. For example, you must use proper turn signals, drive at a safe speed, and observe all other traffic laws.
Output:
D