Which lines from Ovid's "Pyramus and Thisbe" establish setting?

A) "Why, Nature, did you grant the lion's maw such power, and give him claws, but not a gentle heart?"
B) "This tomb is my witness; you, the tree, and my agony are my witnesses."
C) "Now through the still night Cytherean Venus urges on her matched swans."
D) "O happy dagger, this is your sheath."