waxy coating on the stem green pigment in the cells sharp spines as the leaves long roots near the surface
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which structure best protects a cactus from being eaten by animals?
Possibilities:
- waxy coating on the stem
- green pigment in the cells
- sharp spines as the leaves
- long roots near the surface

sharp spines as the leaves