Understanding the reason behind man's pursuit of entertainment over self-improvement

The text explicitly states: "He seeks not self-improvement, but entertainment which would enable him to be mentally idle and to forget his usual activities." The immediate behavioral reason provided for avoiding self-improvement is this active pursuit of mental idleness and amusement (entertainment). Option (b) is incorrect because the passage acknowledges he does have "little leisure" time, but he chooses to spend it on mindless entertainment rather than serious thought.

Answer: (d).