Answer :
Final answer:
A diamond-shaped sign is used to warn drivers to slow down for a double curve. Therefore, the correct answer to the question is option a.
Explanation:
The sign that tells you to slow down because you are approaching a double curve is a diamond-shaped sign. Therefore, the correct answer to the question is option a.
This type of sign is used to warn drivers of upcoming road conditions that require caution, such as curves, turns, or changes in the road layout. When you encounter this sign, it's important to reduce your speed and prepare for the possibility of having to navigate through more than one curve in the road.
