I assume following dependencies for 4(a)
Book-id->Book-category, Author
Author-> Nationality-of-Author
so it is in 2NF since no partial dependency but not in 3NF because the non-prime attribute Author is deriving Nationality
b) If book-title and Author-name is the key then it will be in 1NF because
book-title->book-id
Author-Name->Author-Address,Nationality can be derived
if Address is multivalued attribute then it is not in 1NF also