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 ?
Options:
0. Because we put our next student pilot lesson CD in the player .
1. Because we checked the house .
2. None of the above choices .
3. Because we hit the gas .
Answer: 2