Pick the odd one out.

The correct answer is:

The correct option is a) Penguin.
Like all birds, they lay eggs (oviparous). Every year, penguins travel to their hometowns and carefully lay their eggs. Usually, the female lays her two eggs in early October and takes about 40 days to hatch. Only one of the chicks usually survives. Rest all the animals are viviparous i.e., they give birth directly to young ones.