Question

Which of the following is an extinct species?
A) Duck
B) Dodo
C) Dinosaur
D) Both B and C

Answer 1

When a species of animal or plant dies out, there are no more individuals of that species alive anywhere on the planet. This is a normal part of the evolutionary process. Occasionally, however, extinctions occur at a much faster pace than normal. A mass extinction, for example, occurred 65 million years ago at the end of the Cretaceous period, resulting in the extinction of several different forms of organisms.

Complete solution:
Dodo and Dinosaur are extinct species.
Dodo: The dodo (Raphus cucullatus) is a flightless bird that was once native to the Indian Ocean island of Mauritius, east of Madagascar. A Dutch sailor is thought to have discovered the Dodo in Mauritius in $1598$. "Ugly, Disgusting Bird" is the meaning of the word Dodo. Because of the bird's unusual appearance, it was given the name. The key explanation for the Dodo's extinction is that it was a prime target for predation. The main predators of this species are humans. They were not only killed while alive, but some of their eggs were also eaten. Vultures and coyotes ate Dodo eggs on a regular basis. As a result, the Great Extinction occurred. The last known sighting of a dodo is thought to have been in the $1660s$ or early $1670s$.
Dinosaur: Dinosaurs went extinct about $66$ million years ago, during the transition between the Cretaceous and Paleogene epochs, during a period of global environmental change caused by the collision of a huge celestial object with the Earth and/or massive volcanic eruptions. Apart from the hypothesis that climate change and food supply disruptions played a role in their disappearance, no biological explanation has been proposed to explain why such a diverse range of terrestrial vertebrates vanished.

So the correct answer is option D.

Note:
Human action is now causing rapid extinction as well. Many different species of plants and animals are being forced to the brink of extinction as a result of hunting, habitat loss, and overexploitation of wildlife.