An ambitious young man wants to invent a solution that can dissolve everything. Which of the following advices will best change this young man? ['Many people have already tried this and none have been successful.', 'Theoretical research proves that such a solution does not exist.', 'Researching this solution requires complex processes and equipment, and your conditions are not available.', 'After this solution has been developed, what container do you plan to use to hold it?']