A yellow diamond showing a car with wavy tire tracks behind it means:

Correct answer: A – The roadway may be slippery when wet
This warning sign identifies a section of roadway that becomes more slippery when wet. Rain can reduce tire traction and increase the distance needed to slow or stop. Reduce speed and use smooth steering and braking when the pavement is wet.
Source: West Virginia Driver’s Licensing Handbook — Ch. V, “Diamond & Warning Signs”

