Final answer:
The sea plays written by Eugene O'Neill, starting with Bound East for Cardiff, were produced by the Provincetown Players.
Step-by-step explanation:
The sea plays written by Eugene O'Neill, starting with Bound East for Cardiff, were produced by the Provincetown Players.
The Provincetown Players were a theater company founded by George Cram Cook and others in 1915. They were known for their commitment to producing new and experimental plays.
Susan Glaspell, mentioned in the information provided, was a playwright associated with the Provincetown Players, but she did not produce O'Neill's sea plays.