The weavers have to do monotonous work.

Answer: Option A

Repetitive : containing or characterized by repetition, especially when unnecessary or tiresome.
Exhausting : making one feel very tired; very tiring.
Irksome : irritating; annoying.
Autonomous : (of a country or region) having the freedom to govern itself or control its own affairs.
Monotonous : dull, tedious, and repetitious; lacking in variety and interest.

Synonym of Monotonous is Repetitive