Read the following context and answer the question.
Context: Twins told their neighbor we would be gone until Sunday , We checked the house , locked the doors , hit the gas , and open road here we come . We put our next student pilot lesson CD in the player ( basic flight safety practices and procedures ) . Later one of the twins got a book out of her backpack and they started reading to me . One would read and the other twin would make the sounds .
Question: Why did we lock the doors ?
Answer:


None of the above choices .