Concept: Division of labour has many benefits, but monotony is a major disadvantage.Explanation: Division of labour means breaking a task into smaller, repetitive steps. Workers then perform only one specific operation repeatedly. This leads to specialization, since each person becomes highly skilled in a narrow role. It also encourages automation, as machines can take over simple, repeated actions. Training new employees becomes easier because the tasks are simpler to learn. These are all merits of division of labour. However, doing the same task every day makes the worker bored and tired. This feeling of boredom is called monotony. Monotony reduces job satisfaction and can lower productivity. Therefore, monotony is not a merit but a demerit of division of labour.Answer: D. Creates monotony in the worktask.