There are multiple choice questions in the book and all I a wondering is if there is a website or link that provides me the letter answers
There is no such site in the Stack Exchange network. And there won't be. Stack Exchange was built so you can have experts answer your questions, that you still have despite having researched your question on your own.
Wanting to know a multiple choice answer without reading the textbook it's contained in is the anti-thesis of Stack Exchange's model. It's purposefully avoiding the research that would be trivial because the research material is limited and readily available (assuming you have a copy of the text book), in favor of just asking for the answer.
If you have actually read the textbook, and still find the multiple choice question confusing and have an actual history question, then feel free to visit https://history.stackexchange.com/ and ask your question. About history, not about a textbook.
That said, I think you gathered many downvotes because you just assumed that everybody knows what you were talking about. We are "the global internet", not your 5 local schoolyard buddies. We have no idea what US textbook you are talking about when you use all the abbreviations you take for granted. I think your question would have been closed with a lot less downvotes if you had explained to the global audience what you were talking about, instead of throwing out a number of abbreviations only known to a very constrained local audience. At first glance, I did not even know your history question was off topic, because I couldn't even understand what you were asking.