Amylose is the soluble part of starch. It is a polysaccharide that dissolves in water to some extent, with solubility typically in the range of 20 to 30%.
Step 1: Evaluate the solubility range.
Amylose has a solubility between 20 to 30% in water, which is consistent with the nature of this polysaccharide.
Step 2: Conclusion.
Thus, the correct answer is that amylose has a solubility of 20 to 30%.