In the meanwhile the little child at Troezen on the other side of the sea had grown to be a man. His name, Theseus, was in everybody's mouth, for he had done great deeds of daring; and at last he had come to Athens to find his father, King Aegeus, who had never heard whether he was alive or dead; and when the youth had made himself known, the king had welcomed him to his home and all the people were glad because so noble a prince had come to dwell among them and, in time, to rule over their city. The springtime came again. The black-sailed ship was rigged for another voyage. The rude Cretan soldiers paraded the streets; and the herald of King Minos stood at the gates and shouted:

"Yet three days, O Athenians, and your tribute will be due and must be paid!"

Then in every street the doors of the houses were shut and no man went in or out, but every one sat silent with pale cheeks, and wondered whose lot it would be to be chosen this year.

–“The Cruel Tribute,”
James Baldwin

What directly causes the Athenians to hide in their homes?

the return of spring
the arrival of the Cretan soldiers
the arrival of Theseu
the oppressive rule of King Aegeus