The correct answer is (c). The Nano Hummingbird is a pocket-sized unmanned spy plane developed in the United States. It is about the size of a hummingbird and can fly at speeds of up to 100 miles per hour. It is equipped with a variety of sensors and cameras, and can be used for surveillance and reconnaissance missions.
(a) is incorrect because the Nano Hummingbird is not a new species of hummingbird. It is a man-made aircraft.
(b) is incorrect because the Nano Hummingbird is not an electric car. It is an unmanned aircraft.
(d) is incorrect because the Nano Hummingbird is not a new variety of honey bee. It is an unmanned aircraft.