Answer:
24 Hours
Explanation:
On October 8, 1871, a fire broke out in a barn on the southwest side of Chicago, Illinois. For more than 24 hours, the fire burned through the heart of Chicago, killing 300 people and leaving one-third of the city's population homeless.
What did the development of safety elevator make possible, the answer is B subway
Both answers are B i think
Context Clues
Explanation: Information from the text that helps a reader identify a word and understand its meaning.