Read the following context and choose the best option to answer the question.
Context: I thought that I had better cook it now , before it went bad . And I washed the celery and lettuce so they are ready to eat , too . While those things were cooking , I sewed the button on Jonah 's shirt . In the meantime , Nadav came down for supper and we both had turkey sandwiches . When I was all done , I cleaned up and put everything away . Then I took out the garbage and recycling .
Question: Why did the writer want to cook something before it went bad ?
Options: 
- Because they washed the celery .
 - None of the above choices .
 - Because they washed the lettuce .
 - Because they did n't want to waste the food .


Because they did n't want to waste the food .