What is shown in the image?

The correct answer is D. Slow moving vehicle.

In the image, there is a triangular orange sign with a symbol of a slow-moving vehicle depicted on it. This sign indicates that there is a slow-moving vehicle or equipment on the road ahead. Drivers should be prepared to reduce speed and proceed with caution when they see this sign to ensure the safety of everyone on the road.

The other options are not correct because they do not match the symbol shown on the sign in the image.