The tone will be more negative and depressing is the correct answer.
Explanation:
In this question there are two important elements: the typical American town in the 1950s and a prison camp in WWII, which took place between 1939 and 1945. It is important to indicate that the tone is the attitude chosen by the writer toward an audience or a subject. Due to the terrible context (WWII), the tone will be more negative and depressing.
