their large, chemical-energy reserve their large, stored-electric potential the complexity of their folded structure the wide variety of elements they include
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which property of proteins best allows them to perform an enormously diverse range of functions?
Possibilities:
- their large, chemical-energy reserve
- their large, stored-electric potential
- the complexity of their folded structure
- the wide variety of elements they include

the complexity of their folded structure