4- stage life cycle is only for insects.

The four stages are egg, larva, pupa and adult.

A and B do not have 3 pairs of legs so that already ruled out that they are insects.  So A & B are out.

In the 4-stage cycle, the young does not look like the adult. (larva/pupa) so A is out again.

Finally, animals who lay eggs in water can have 3-stage cycle egg, larva, and adult, eg. frogs..so B is out again.

Thanks a lot for your help. God bless you. 🙂