The answer is c. The number of different times zones in the United States
I do not understand. Can you give more info so i can answer?
Reading a work of literature is often related to one's personal beliefs and opinions because when you read something you often connect what you read with what you know and this affects your beliefs and opinions about the book but also about general things, as well as vice versa. Once you read a book, this further increases and changes your stance on certain things. It therefore changes your opinions and beliefs.