We took ourselves off to the museum , delightfully cool in the aircon - it 's around 35 outside . I was inspired by the olympic swimming and rushed into the refreshing river , picking my way through broken glass . Dinner was going to be at a nice hotel as a special treat but low and behold , no food . They were cleaning .

Question: Why was there broken glass in the swimming pool ?
Answer: Someone played a prank on the swimmers at the pool by putting broken glass in itNone of the above choices .They put glass in the swimming pool to deter people from swimming thereThey use broken glass as a deterrent to prevent people touching the bottom of the pool