(A) is not the answer, because the author does this in “… there is no necessary connection”, referring to the assertion that those who spend time plucking out their gray hairs have more negative attitudes towards the elderly than those who shrug their shoulders about their gray hairs.
(B) is not the answer, because the author does this in “Certainly it is reasonably to like the elderly yet dislike the idea of impaired eyesight and hearing.”
(C) is not the answer, because the author appeals to the “nearly universally accepted ethical standards” in claiming that holding negative attitudes towards older people merely because they are old is immoral.
(D) is the CORRECT ANSWER choice. The author does not discredit any stereotypes about the elderly in the argument.
(E) is not the answer, because the author makes the distinction between holding negative attitudes toward older people merely because they are old, and disliking some concomitants of the aging process.
FINAL ANSWER IS (D)