Question: The librarian located the book in the stacks. What is the cause?

Answer: I requested the librarian's help.

Question: The city re-elected the mayor. What is the cause?

Answer: The mayor fulfilled his promises.

Question: The guests of the party hid behind the couch. What is the cause?

Answer: It was a surprise party.

Question: The company lost money. What is the cause?

Answer:
Some of its products were manufactured defectively.