Read the following context and choose the best option to answer the question.
Context: What a melodious sound they made . If one of us could n't transport them to an event , the other would . One summer when I was in the doctoral program and we only had one car ( the one my husband drove to work ) Carol did all the transporting of my kids . Whenever someone commented that they wished they could get their kids involved but they just did n't have time , Carol would say , " Its either now or later . " We were not stay - at - home moms .
Question: Why did they only have one car at the time ?
Options: 
- They were unable to afford another vehicle .
 - They lived on their own so they only needed one .
 - They do n't like to drive a car around .
 - They only needed the vehicle for themselves .


They were unable to afford another vehicle .