It is incorrect to say that seniors over the age of 60 are not interested in the supergirl entertainment show. A recent survey report from a college showed that 83% of the 3,500 seniors who returned the questionnaires The elderly said that they really enjoyed watching Super Girls. Which of the following, if true, would most weaken the conclusion? ["the college's questionnaire survey lacks authority, and its preparation accuracy value is discussed.", 'the elderly who filled out and returned the questionnaire are actually under 60.', 'a few elderly people who returned the questionnaire were actually under 60.', 'most seniors who return the questionnaire also like other entertainment programs at the same time.']