Which sentence gives the reader a clue about the story’s historical setting?

Responses
A She didn’t know exactly how she would survive such turmoil, but she was bound to make it back home—even if it nearly killed her.She didn’t know exactly how she would survive such turmoil, but she was bound to make it back home—even if it nearly killed her.
B She reached for the photograph of her parents, but to her surprise, it wasn’t there.She reached for the photograph of her parents, but to her surprise, it wasn’t there.
C Gladys and her mother were separated from her father at the concentration camp.Gladys and her mother were separated from her father at the concentration camp.
D Two days later Gladys ran into Francis at their duty stations.Two days later Gladys ran into Francis at their duty stations.

C Gladys and her mother were separated from her father at the concentration camp.