We know that there are (4^9)^5 ⋅ 4^0 at the library, so we just need to simplify this to get the answer. (4^9)^5 ⋅ 4^0 =(4^9)^5×1 =(4^9)^5 =4^9×5 =4^45. As a result, the total number of books at the library is 4^45 books at the library or B is the final answer. Hope it help!
