Certain Forms of Biosynthetic Insulin Are Absorbed More Rapidly Than

Certain forms of biosynthetic insulin are absorbed more rapidly than regular human insulin because:

A) other substances such as acetate or protamine have been added to the insulin molecule to increase absorption.
B) zinc has been added to the insulin molecule to increase absorption.
C) newer forms of biosynthetic insulin can be administered orally via slow-release or sustained-release preparations.
D) the amino acid sequence of the insulin molecule has been altered to allow more rapid absorption
E) none of the above