Explanation:

The correct answer is option C - Curve ahead sign.

The curve ahead sign is a common traffic sign that warns drivers of an upcoming sharp turn on the road. This sign is essential for the safety of motorists as it alerts them to reduce speed and approach the curve with caution. Here's a detailed explanation of why the curve ahead sign is the correct answer:

1. Purpose of Traffic Signs:
Traffic signs are an integral part of road safety. They provide important information to drivers, such as speed limits, directions, hazards, and warnings. These signs help drivers make quick and informed decisions while driving, ensuring the safety of both themselves and others on the road.

2. Warning Signs:
Warning signs are a crucial type of traffic sign that alerts drivers about potential hazards or unusual conditions ahead. These signs are typically triangular with a red border and black symbols or text. They are designed to attract attention and prompt drivers to take necessary precautions.

3. Sharp Turns:
Sharp turns are bends or curves in the road that have a small radius of curvature. These turns require drivers to slow down significantly to navigate them safely. Failing to do so can lead to accidents, especially if the turn is sudden or unexpected.

4. Curve Ahead Sign:
The curve ahead sign is specifically designed to warn drivers about an upcoming sharp turn. It consists of a yellow background with a black symbol depicting a curved arrow. This sign is placed a sufficient distance before the curve to provide drivers with ample time to adjust their speed and position on the road.

5. Importance of the Curve Ahead Sign:
The curve ahead sign plays a crucial role in preventing accidents and ensuring the safety of motorists. By alerting drivers in advance, it allows them to anticipate the curve and adjust their speed accordingly. This reduces the risk of losing control, skidding, or colliding with other vehicles.

Conclusion:
In conclusion, the correct traffic sign that warns drivers about a sharp turn ahead is the curve ahead sign. This sign is essential for road safety as it alerts drivers to reduce speed and approach the curve with caution. By following the instructions provided by traffic signs, drivers can navigate the roads safely and prevent accidents.