The answer, of course, it ALL of them.
It helps to know which stage is a butterfly. When I do presentations for children or students, I always ask that question.
We have a BUTTERFLY egg (undeveloped butterfly), a BUTTERFLY child (young butterfly – caterpillar), a BUTTERFLY teenager (chrysalis – a maturing butterfly – going through sexual maturity), and an adult BUTTERFLY.
They are all the same organism, same critter, just one that is maturing. The caterpillar is not a different creature. It simply has a different appearance. The chrysalis is not a different creature. It simply has a different appearance.
A few years ago, a woman called our office, asking how she can kill the ‘worms’ eating her passion vine without harming the butterflies. She was unable to grasp the fact that the ‘worms’ (caterpillars) were butterflies in child form. Once people grasp that important fact, they begin to use less pesticides and plant more host plants.