Florist: Some people like to have green carnations on St. Patrick' s Day. But flowers that are naturally green are extremely rare. Thus, it is very difficult for plant breeders to produce green carnations. Before St. Patrick' s Day, then, it is wise for florists to stock up on white carnations, which are fairly inexpensive and quite easy to dye green. Which one of the following most accurately expresses the overall conclusion of the florist's argument? ['White carnations are fairly inexpensive and can easily be dyed green.', "There are some people who like to have green carnations on St. Patrick's Day.", "It is a good idea for florists to stock up on white carnations before St. Patrick's Day.", 'It is very difficult to breed green carnations.']