As per the question, the event leading to a solution in the passage was 'Tamica's phone call with her mother.' Before the call, she was extremely tensed after missing her plane to the United States which was also the last plane for that night. She didn't know what to do as she had already left the place where she lived with other students and the city was not known to her. She was left clueless about how to spend the long night at the Heathrow airport butafter the call, she gets to way to get out of this problem as one of her mom's friend live near the airport. Thus, this event brings a solution to her problem and hence, <u>option C</u> is the correct answer.
