What is shown in the image?

The correct answer is B. Winding road.

In the image, you can see a road that is curving to the left, indicating a winding or curved road ahead. This sign is important for drivers to be prepared for changes in direction and adjust their speed accordingly to navigate the road safely.

Options A, C, and D are incorrect:

A. Hidden intersection ahead: This would typically be represented by a different road sign showing a T-intersection symbol or warning of a hidden intersection.

C. Narrow road ahead: This would be denoted by a different road sign indicating a narrowing or constricted road ahead.

D. Road slippery when wet: This would usually be shown by a road sign featuring skid marks or a slipperiness symbol.