People with serious financial problems are so worried about money that they cannot be happy. Their misery makes everyone close to them -- family, friends, colleagues -- unhappy as well. Only if their financial problems are solved can they and those around them be happy. Which one of the following statements can be properly inferred from the passage? ['People who do not have serious financial problems will be happy.', 'Only serious problems make people unhappy.', 'People who solve their serious financial problems will be happy.', 'If people are happy, they do not have serious financial problems.']