Who's gonna tell him?

The funny thing is that Astarion would approve of (3) if the victim were anyone except Astarion.

Wait a sec. Is this Tangled?

Attack

The only difference between option 2 and 3 is that you're lying with 3.

I'd go with 2 because my character is honest.

Gale casting mirror image for lulz and leaving poor Astarion wondering.

Wouldn't want to imagine what could happen if I failed that arcana check in 4.