Which sentence with a transition is punctuated correctly? I trained hard for the marathon however I failed to finish.

I trained hard for the marathon, however, I failed to finish.

I trained hard for the marathon; however I failed to finish.

I trained hard for the marathon; however, I failed to finish.

Sentence 2

Explanation:

The commas, period, grammar, and capitalization, are all correct.

the servant does not kill the child oedipus as he was ordered to do because "he pitied the child" based on the oedipus rex story. the servant was ordered to kill the child because of the prophecy that predicted king laius' death. the king already had attempted to hurt oedipus by piercing oedipus's ankle. however, the servant did not finish the job and he rather saved the baby oedipus.

explanation: