A thunderstorm hit my neighborhood hard on an evening in July . It suited my mood . I raised my umbrella and walked outside . The rivers on the streets were warm ; the rivers on the sidewalks were cool .

Question: What might be a good reason not to walk outside with an umbrella right now ?
Answer: My umbrella might be swept away by the tornado winds .None of the above choices .The rivers on the streets might cause hypothermia .There may be lightning associated with the thunderstorm .