This road sign means:

You are about to enter a one-way street from the wrong direction.
U-turns are prohibited.
You may proceed if the way is clear.
The Correct Answer and Explanation is :
The correct answer for this road sign is: “You are about to enter a one-way street from the wrong direction.”
Explanation:
The road sign in question is the “Do Not Enter” sign, which is a regulatory sign used to indicate that vehicles are not allowed to proceed past that point. This sign is typically a red circle with a horizontal white bar across the middle. It is used to prevent drivers from entering streets, roads, or areas where they should not be, ensuring safety and proper traffic flow.
This specific sign means that if you are approaching an intersection or a road that has this sign, you should not enter, as doing so would put you in direct conflict with oncoming traffic. Entering a one-way street from the wrong direction is extremely dangerous, as it could lead to head-on collisions, which pose significant risks to both the driver and other road users.
While some drivers might believe that U-turns are related to this sign, the sign itself does not prohibit U-turns directly. U-turns are regulated by other signs or traffic laws that indicate whether or not a U-turn is permissible at a specific location. Therefore, if you see a “Do Not Enter” sign, it is not because U-turns are forbidden, but because you should not enter the road or area under any circumstances.
It’s important to understand and recognize this sign to avoid serious accidents and ensure safe driving practices. When approaching a “Do Not Enter” sign, always stop, assess your surroundings, and proceed in the correct direction as indicated by traffic markings and other signs. Ignoring this sign can lead to traffic violations and potential accidents, contributing to unsafe road conditions. Always abide by such signs to maintain safety and legal compliance on the road.