Context: 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 ?
Options:
0. Someone played a prank on the swimmers at the pool by putting broken glass in it
1. None of the above choices .
2. They put glass in the swimming pool to deter people from swimming there
3. They use broken glass as a deterrent to prevent people touching the bottom of the pool
Answer: 1