In response to my recent post on concentrated soaps , Sue writes : Bob & I had a discussion after your last post on this topic . We had a large bottle of concentrated soap , and a small soap bottle empty . So we filled the empty bottle to the 1/4 mark with the concentrate , and diluted it 3:1 with water .
According to the above context, choose the best option to answer the following question.
Question: Why might the people have done this ?
Options:
- Because they do n't have much soap
 - To save money
 - Because someone told them to
 - None of the above choices .


To save money