The reason why Helios allowed Apollo and his friends to pass was because Apollo agreed to B. kill Medea, which would free Helios
What did Apollo promise to do?
Apollo was the god of the sun which was a position that Helios once held. This led to Helios becoming a semi-conscious flame as not too many people worshipped him any longer.
Helios's essence was then taken over by Medea and Apollo promises to kill Medea to free Helios so he lets him pass.
Find out more on the Apollo at https://brainly.com/question/1191220
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