Caterpillars hang upside down from a twig or branch and spin a cocoon around their bodies. Their bodies transform while in the cocoon, and when they ? they are totally different insects with wings.
a. when they emerge
b. when they awaken
c when they develop
d. when they launch

a. when they emerge

Explanation:

This excerpt deals with a life cycle of a butterfly, which goes from an egg to a caterpillar to a pupa, finally, to a butterfly.

After they cover themselves with a cocoon, caterpillars shed layers of their skin to form a pupa ( or chrysalis). In this stage, they undergo changes, metamorphosis and remodeling of their cells to turn into a butterfly which will emerge from the cocoon.

All the given answers may sound similar and have almost the same meaning, but when it comes to butterflies, the correct verb is to emerge from the cocoon.

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