It's difficult to answer this question in a straight-forward manner, because according to what I know, there isn't one. Even if I gave characteristics, I can hear the voice of his ghost refuting everything and bringing up valid arguments. Euthyphro's answers were also deemed unsatisfactory. Socrates wanted a single characteristic as to what makes pious actions pious, something to tie them all together. In the world he lived in, it was called 'essence', and was in a plane beyond ours. To Christians, what may tie us together would be the belief in God. It's something we all share without going into specifics, nor addressing good versus bad. When a subject such as measuring goodness comes into question, it all boils down to individuality. Who are we to decide what is right or wrong

The correct answer to this open question is the following.

Although there are no options attached we can comment on the following.

When a subject such as measuring goodness comes into question, it all boils down to individuality. That is why it is me to decide what is right or wrong, based on my belief systems, my education, my ethics, my religious teachings, previous experiences, respect for other people, and my own will.

As the question says, it is a complicated issue and the answer could be a controversial one, but as difficult as it is, it has to be answered to ponder the nature of the human being.

This question talks about the dialogue between Socrates and Euthyphro regarding piety, its true meaning. After Socrates had been accused of impiety, he opened this discussion because he was going to be tried before the Athenian legal system, the court. This court would have the final decision to determine if he was guilty or not.

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