Option 1 -> The author emphasizes worldly advantages but doesn't specifically warn against ignoring them when studying.
Option 2 -> The author actually advocates for dancing and deportment throughout, not against it—this doesn't align with the passage's warnings about studying.
Option 3 -> Directly warned: "avoid pouring over books until bent double...A stoop diminishes public and private standing" and harms "both health and esteem."
Option 4 -> While the author warns against excessive book study, the focus is on posture/stoop rather than practical tasks specifically.
Hence, Option 3 -> The author explicitly cautions against developing a stoop from bending over books, stating this habit is "hard to break and harmful to both health and esteem" and "diminishes public and private standing" -> correct
Note: The provided answer indicates "2,3" but Option 2 contradicts the passage's advocacy for dancing. Option 3 alone directly matches the author's warning about studying posture.