I believe the answer is Romeo is unhappy, and merciful is upbeat
Your answer would be A, that I borrowed from the library
When trying to figure out what an adjective clause is ask the two questions
which and what? So what book? Which book?
Hope this helps :)
Abode, Apartment, Cabin, Condominium, Domicile, Dwelling, Flat, Habitation, Home, Lodging, Mansion, Residence