The question asks for the correct logical sequence of transformations in the life cycle of a butterfly. This process is known as complete metamorphosis, and it involves four distinct stages:

1. Egg: The life cycle begins when the female butterfly lays eggs on a host plant. This is the first stage and the origin of the entire cycle.
2. Caterpillar (Larva): Once the eggs hatch, caterpillars (or larvae) emerge. This stage is characterized by rapid growth as the caterpillar feeds voraciously on plant leaves.
3. Chrysalis (Pupa): After its growth period, the caterpillar forms a chrysalis or pupa. Inside the pupa, the transformation into a butterfly takes place through a process called metamorphosis.
4. Butterfly: The final stage is when the fully developed adult butterfly emerges from the chrysalis, completing the life cycle.

The correct logical sequence of the words based on this life cycle is: (a) Egg, (b) Caterpillar, (c) Chrysalis, (d) Butterfly.

Thus, the correct answer is: (a), (b), (c), (d).