Final answer:
The freeze frame at the end of 400 Blows represents Antoine's alienation, symbolizes his entrapment, and serves as a reminder of the harsh realities he faces.
Step-by-step explanation:
The freeze frame at the end of the film 400 Blows has a multi-layered significance. It (A) represents Antoine's alienation from the world around him, as he feels disconnected and misunderstood by society. (B) It symbolizes his entrapment in a moment of time, freezing him in a state of emotional turmoil and uncertainty. (C) It serves as a reminder of the harsh realities of life that Antoine faces, highlighting the challenges and difficulties he has endured.