Which of these may be an abnormality during your pre-drive check?

A. There is another vehicle nearby.

B. Your mirrors are aligned.

C. The steering wheel responds.

D. There's an unidentified puddle.

I could say B. Your mirrors are aligned. Because the mirrors are important for your pre-drive check from all of the rest of the following. So I could suggest with B. Your mirrors are aligned.

D. There's an unidentified puddle.

Explanation:

When you perform your pre-drive check you have to inspect things like: the tires are in good condition, the lights are working, the mirrors are aligned, the wheel responds and you also need to check under the car to make sure that there are no fluids in the floor as these may indicate that there is something leaking and needs to be checked. According to this, an abnormality during your pre-drive check may be an unidentified puddle.