The correct option is A 9
Number of book Boots has = 200
Number of boxes Bubbles gives Boots = 7
Number of books in each box = 100
So, number of books Bubbles gives = 100 + 100 + 100 + 100 + 100 + 100 + 100 = 700
Total number of books = 200 + 700 = 900
900 has 9 Hundreds, 0 Tens, and 0 Ones.
Hence, Boots has 9 sets of hundred books.