We can analyze each of the statements. Responses of tourist who wish to visit these beaches: this is a biased sample, because they already want to go there so they have a positive opinion which may o may not be a direct perception. Responses from government officials of the countries where the beaches are located: not reliable because they have an interest to promote tourism toward their countries. Responses from tourists who have visited the beaches: this seems an appropiate group because they are the persons who have a real experience as tourist of those beaches and shoulb be more objective that the others. Responses from you friendes and family: hard to believe that they know most of the best beaches of the world to give a response bases on facts. Then, the answer is the option Responses from tourists who have visited the beaches.
