Which of the following is not an example of an illegal performance of a lawful contract?

a)A person agrees to paint a house but uses a nonconforming color in an historic residential district.

b)A person contracts to pick up a business's trash and then dumps it in the ocean.

c)A person contracts to clean up after a town event and does it after town curfew.

d)A person contracts to deliver pizza and speeds to get it there on time.

e)A person contracts to post harmful lies about another on social media.