Final answer:
The railway crossing sign that tells you to look both ways for a train is in the shape of a diamond. The diamond shape is used because it is easily recognizable and can alert drivers to the potential danger of a railway crossing. In social studies, students learn about transportation systems, including road safety and traffic signs.
Step-by-step explanation:
The railway crossing sign that tells you to look both ways for a train is in the shape of a diamond (option d).
The diamond shape is used because it is easily recognizable and can alert drivers to the potential danger of a railway crossing. The shape is also used to indicate that extra caution should be taken, as the intersection of the railway track and road can be hazardous.
In social studies, students learn about transportation systems, including road safety and traffic signs. They also learn about the importance of following rules and regulations for public safety.