Final answer:
In Social Studies, it is true that you should salute a vehicle if it is transporting a senior commissioned officer. The correct option is a.
Step-by-step explanation:
In Social Studies, specifically in the context of military protocol, it is true that you should salute a vehicle if it is transporting a senior commissioned officer.
Saluting is a sign of respect and recognition of a higher ranking officer. When a senior commissioned officer is being transported in a vehicle, the act of saluting the vehicle is a way to acknowledge their presence and show respect for their rank and authority.
For example, if you see a vehicle with a senior commissioned officer inside, you should come to attention and render a salute until the vehicle passes or the officer acknowledges the salute.
The correct option is a.