It would be (B) I hope that helps yoi
enzymes in your small intestine break them down.
c) makes them immune to all diseases
This is the choice you are looking for because is ISN'T a way that adaptation helps the organism survive life. If it is immune to all diseases, that organism would probably die because of all the diseases that it is immune to.
The other choices have adaptations that will help the organism survive.
Hope I helped.