Format includes which of the following choices? a) a formal, business-like message and style b) the authors word choices, sentence lengths, and attitude c) text features such ask font size, type. and use of boldface or italics d) the readers response to the writer and the message

Format includes which of the following choices:

C. Text features such as font size, type and use of boldface or italics.

There are many formats that one can use when writing a document. However,  MLA style and APA are known formats. This are "rules" about format that indicate the font size and style that should be used. As well as how to cite references and when to use italics. Whenever, you enter Word you will see a tab that says format and it has many options for features such as font size, type and use of boldface or italics.

in the shadow of war

the answer is both an appeal to ethos and logos (if that's what your question options were)