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. :)
Answer:
slightly frightening but useful.
C. He is dissatisfied and feels disillusioned with his surroundings.
Hi! I think the answer is either number 2. or number 3. I hope this helps, Goodluck!