Which detail from the story the magic prison foreshadows a palace becoming a prison

took the test and got this question right.

if one of the option answer is this one here:

"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."

Explanation:

because of all the immigration, america became one big melting pot. the diversity of cultures from all over the world made america somewhat divided as well. people that immigrated stayed with their kind, and their traditions, while native born americans stayed with their kind and their traditions. normally, people born in american scorned the immigrants as well. the new religions also divided america. in summary, it took away from the american culture and identified america as the "melting pot."

it is the : d because is true