How can you make sure that you understand things that are implied by an author?

The answer is b. new mexico

I. can’t see the paragraph

Boy. i guess i'm late.

At midnight thomas edison opened the door and continued his work, but to his surprise it was so late that he had to get some rest. but with his mind racing and his mind at sake he continued working. hours and hours went untill he got it. he had invented the worlds first lightbulb!