I believe the proper answer would be "Sentence 3".
Explanation:
Pay attention to the face. ... Pay attention to the cheeks and forehead. ... Pay attention to the eyes and eyebrows. ... Pay attention to the glasses. ... Pay attention to the facial hair or lack thereof. ... Pay attention to facial moles.
Presenting sound reasons and credible evidence for the author's claim.
D) He believes that the person at the reference desk will best be able to help Saul find what he needs.
