slowing down the plot to focus on an important character.
Plot, in literature, refers to a sequence of events.
In the passage, the author took time to describe the travails of the people of Athens and their constant prayers for solution. This slow pace is to ensure that focus is eventually shifted to a new character (Theseus) when he is later mentioned.
The thorough description of the woes of the people of Athens is aimed at painting a messianic picture of the little child at Troezen who has now grown up.
By creating suspense through this sequence of events, readers will be anxious to know what will become of the people of Athens, and that will present Theseus as a very important character
Therefore, the choice "slowing down the plot to focus on an important character." is the correct option.