The correct answer is A. Employed : Jobless.
Lively is the opposite of dull, and employed is the opposite of jobless. Both lively and employed are positive words, while dull and jobless are negative words. Lively and employed also both refer to a state of being, while dull and jobless refer to a lack of something.
B. Flower : Bud is not a good analogy because a flower is not the opposite of a bud. A flower is a mature plant, while a bud is an immature plant. They are not opposites, but rather different stages in the life cycle of a plant.
C. Factory : Labour is not a good analogy because a factory is not the opposite of labour. A factory is a building where goods are manufactured, while labour is the work that people do. They are not opposites, but rather different things.
D. Happy : Gay is not a good analogy because happy and gay are not opposites. Happy is a feeling of joy, while gay is an adjective that describes someone's sexual orientation. They are not opposites, but rather different things.
