This sign is used to warn drivers about:

Upcoming intersections.
Road construction.
An upcoming curve in the road.
Changes in traffic lanes.
The Correct Answer and Explanation is :
The correct answer is “An upcoming curve in the road.”
This sign is a warning sign used to inform drivers of a curve ahead, in this case, a curve to the right. These types of signs are part of a larger category of road signs known as warning signs, which are meant to alert drivers about potential hazards or changes in the road conditions that require caution and slower speeds to navigate safely.
The shape of this particular sign is diamond-shaped, which is the standard shape for warning signs. The color is yellow, another characteristic that is typical of warning signs, designed to catch the driver’s attention and provide enough visibility under most weather conditions. The black arrow on the sign indicates the direction of the curve — in this case, a curve to the right. The symbol conveys to drivers that they should prepare to adjust their steering as the road bends.
The purpose of such signs is to increase safety by giving drivers advanced notice of potentially hazardous situations. A sharp curve can be dangerous if drivers are not prepared for it, especially at higher speeds. Without the sign, drivers might not reduce their speed in time, leading to accidents. The curve sign gives them the information they need to slow down and navigate the bend more safely.
This sign is not used to indicate road construction, upcoming intersections, or changes in traffic lanes. While road construction signs might appear similar (often using orange colors), they are usually labeled explicitly with words like “Construction” or “Men at Work.” Intersections or lane changes are also marked with specific signs, such as stop signs or lane control signals, which are different from curve warning signs.