Which Are Biological Examples of Potential Energy (PE) and Kinetic

Which are biological examples of potential energy (PE) and kinetic energy (KE) ?

A) PE = concentration gradient; KE = chemical bonds
B) PE = muscle contraction; KE = electrical charge imbalance
C) PE = chemical bonds; KE = ion movement across a membrane
D) PE = electrical charge imbalance; KE = concentration gradient
E) PE = protein conformational change; KE = muscle contraction