D. Junction (The other words relate to legal matters or rules, while "Junction" refers to a physical connection or meeting point.)

A. System (The other words relate to individual actions or behaviors.)

D. Tricycle (The other words relate to safety or actions to ensure safety.)

B. Obedient (The other words relate to actions that are prohibited or restricted.)

A. System (The other words relate to specific actions or objects.)

C. Stuck (The other words relate to transportation or routes.)