Can you change a cladogram?

Yes you can but you would need solid evidence to do it, we used to think that lizards and crocs were more closely related because of their appearance or phylogeny but with new and better evidence we now hypothesize (clads are just hypotheses) that birds and crocs are more related

Explanation:

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

c should be the answer