Why did he fall?

Directions: Read the passage carefully and answer the question that follows.

Aman tripped while he was trying to catch a bus. He was on the floor. The bus left without him. "Are you alright?" a girl asked. He was holding his arm. "I think I broke my arm," he said to the girl. The girl dialled 102. "Help is on the way," she said. She helped him up. He wondered why he fell. He looked down and saw his laces were untied. He forgot to tie his laces many times. He started to cry. His arm was in terrible pain. "The ambulance is coming soon," the girl said. She felt bad for the boy. She knew how much it would have hurt because she had had a similar experience a few months ago.