Concept:The extract shows Theseus giving orders to Philostrate before he turns to speak to Hippolyta.Explanation:Theseus begins by addressing Philostrate with the command "Go, Philostrate."This means he is sending Philostrate away to organise the wedding celebrations.Philostrate, being obedient, leaves while Theseus continues speaking.So, at the moment Theseus is talking, Philostrate departs from the scene.Answer:D. Philostrate departs.