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. :)
You should let your emotions out. Don't hold them in that only makes it worse... Losing someone you love is very hard and i'm glad you're still here... You should try to vent to someone you trust so you can let everything out. I hope you're okay and i hope you know you're loved.