The correct answer is option is c) oviparous. Bird are oviparous. They lay eggs and produce young ones by means of eggs which are hatched after they have been laid. Ovoviviparous animals are those animals which give birth to young ones without placenta formation as in shark. Viviparous animals give birth to the young ones with placenta formation as in humans.

Introduction:
Birds are a diverse group of animals that belong to the class Aves. They are warm-blooded, feathered, and lay eggs. The method of reproduction in birds is different from most other animals. In this response, we will discuss the method of reproduction in birds and answer the question: Are birds viviparous, ovoviviparous, or oviparous?

Oviparous:
The term oviparous refers to animals that lay eggs. Birds are oviparous animals, which means that they lay eggs. The fertilization of the egg occurs inside the female bird's body, and the egg is then laid outside of the body. The eggshell protects the developing embryo and provides it with the necessary nutrients to grow.

Egg Development:
The development of the egg inside the shell takes around 21 days for most bird species. During this time, the embryo develops and grows, and the egg yolk provides it with the necessary nutrients. The incubation of the egg is done by the female bird, and in some species, the male bird also helps in the incubation process.

Ovoviviparous:
The term ovoviviparous refers to animals that produce eggs that hatch inside the body. Birds are not ovoviviparous animals because they lay eggs outside of their body. However, there are some reptiles, such as snakes and lizards, that are ovoviviparous.

Viviparous:
The term viviparous refers to animals that give birth to live young. Birds are not viviparous animals because they lay eggs. Mammals, such as humans, dogs, and cats, are viviparous animals.

Conclusion:
In conclusion, birds are oviparous animals because they lay eggs. The development of the egg occurs outside of the female bird's body, and the incubation of the egg is done by the female bird. Birds are not ovoviviparous or viviparous animals.