Final answer:
In most jurisdictions, it is necessary to stop when a school bus stops on an undivided two-way highway, to ensure the safety of students.
Step-by-step explanation:
In most jurisdictions, it is necessary to stop when a school bus stops on an undivided two-way highway. This is to ensure the safety of students who are boarding or exiting the bus. The purpose of stopping is to prevent accidents and protect children from any potential harm.
For example, in the United States, it is required by law in all 50 states for drivers to stop when a school bus is displaying its stop sign and flashing red lights. Failure to stop can result in penalties, such as fines and license suspension.
Therefore, the answer to your question is A) Yes, it is necessary to stop when a school bus stops on an undivided two-way highway.