Dragon Fly’ is the nick name of a machine that extracts

The correct answer is (a). Dragon Fly is a machine that extracts moisture from the air to produce drinking water. It is a type of dehumidifier that uses a process called condensation to collect water vapor from the air. The water is then filtered and purified to make it safe to drink.

(b) is incorrect because the machine does not extract usable hydrocarbons from automobile exhaust.

(c) is incorrect because the machine does not extract edible oil from oil cake waste.

(d) is incorrect because the machine does not extract fiber from wood waste for use in textile industry.