Correct Answer - Option 2 : 3, 4, 2, 1
According to the given information :
First of all egg is laid down.
Then worm comes out of the egg.
After that, Worm turns into cocoon.
And in last, cocoon becomes butterfly.
So, the meaningful sequence will be Egg - Worm - Cocoon - Butterfly.
Hence, the correct answer is "3, 4, 2, 1".