Portman,who Runs a Computer Hardware Store,had Signed a Contract with Stewie

Multiple Choice

Portman,who runs a computer hardware store,had signed a contract with Stewie Inc.to deliver 125 computer monitors.He was to deliver it by the 5th of August,but by the 3rd of August,Portman could not arrange for the monitors,as his regular supplier was not available.He then decided to go to another supplier who had a higher selling price for monitors rather than cancelling the contract with Stewie Inc. ,as he believed it was his duty to do so.Which of the following moral theories matches Portman's behavior?

A) Kantian ethics
B) utilitarianism
C) Rawls's social justice theory
D) ethical fundamentalism