Context: For some random reason ( i.e. no reason ) Alex decided that after lunch today we needed to go to the beach . Just the three of us . Keely has discovered the joy of sand castles . She made one while her daddy took care of a wall to protect it from the waves .

Question: Why ca n't you protect a sandcastle by building a wall ?
Options:
0. Walls do n't work to keep people out
1. The tide will come in anyway and engulf it
2. Some nasty kid will come along and stomp on it
3. None of the above choices .
Answer: 1