Final answer:
Socrates challenges Euthyphro's definition of piety by suggesting that since gods have conflicting interests, there must be an independent standard of goodness beyond the whims of the gods.
Step-by-step explanation:
Socrates criticizes Euthyphro's third definition of piety, which Euthyphro claims as 'the godly and pious is part of the just that is concerned with the care of the gods', by questioning the basis and the consistency of what pleases the gods. According to Socrates, the gods often have conflicting interests and engage in behaviors that humans would find morally questionable. Socrates introduces a philosophical dilemma known as the Euthyphro problem, which challenges whether an action is pious because it pleases the gods, or if it pleases the gods because it is inherently pious. He suggests that morality may exist independently of divine command, requiring some standard of goodness that even the gods must adhere to.