Soliloquy- an act of speaking one's thoughts aloud when by oneself or regardless of any hearers, especially by a character in a play.
Ingenious- of a person or action) innocent and unsuspecting
It is either one of those not quite sure but I hope I helped a bit!
It's probably c. Either a necklace or earrings looks nice with that dress.
because i kinda feel like it agrees with its compound subject like u said. but i'm not really sure if that's riight although i just wanted to help that's all there's to it. :)