Which detail from "The Magic Prison" foreshadows that the prison is becoming a palace again?

Question

Responses

"Just then he heard a harsh, grating sound, as of rusty bolts sliding with difficulty out of their sockets; and then faint rays of light, not wider than a hair, began to shine between the heavy mirrors."
"Just then he heard a harsh, grating sound, as of rusty bolts sliding with difficulty out of their sockets; and then faint rays of light, not wider than a hair, began to shine between the heavy mirrors."

"One day, soon after this, the little bird fluttered up against the windowpane and beat his wings against it in a vain effort."
"One day, soon after this, the little bird fluttered up against the windowpane and beat his wings against it in a vain effort."

"At last he heard, or thought he heard, a faint sound. He listened eagerly. It seemed to be some tiny creature not far from him trying to move about."
"At last he heard, or thought he heard, a faint sound. He listened eagerly. It seemed to be some tiny creature not far from him trying to move about."

"The next day he was so hungry that he began to eat one of the old withered apples, and as he bit it he thought of the bird, his fellow prisoner."
"The next day he was so hungry that he began to eat one of the old withered apples, and as he bit it he thought of the bird, his fellow prisoner."

Answer 1

The detail that foreshadows that the prison is becoming a palace again is:

"Just then he heard a harsh, grating sound, as of rusty bolts sliding with difficulty out of their sockets; and then faint rays of light, not wider than a hair, began to shine between the heavy mirrors."

This description of the rusty bolts and light shining through suggests a change in the environment, indicating that the prison is on the brink of transformation back into a palace.