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 .
Why ca n't you protect a sandcastle by building a wall ?
Pick the best answer from the following options:
- Walls do n't work to keep people out
 - The tide will come in anyway and engulf it
 - Some nasty kid will come along and stomp on it
 - None of the above choices .


The tide will come in anyway and engulf it