What kind of sources is MLA 8 geared toward? -
Online sources
Print sources
Journal articles

MLA 8 was designed to simplify the process, helping writers accurately and intuitively cite sources more easily, requiring that every source type follow the same format. This means that books, websites, periodicals, videos, photographs, and all other types of sources now use this same standard format.

A). It includes the topic of the text.

C).  It includes the author's viewpoint.

E).  It is the underlying message of the text.

F).  It is comparable to the theme (for a work of fiction).

Explanation:

As per the question, the above options states the true claim regarding the controlling idea of a text. The controlling idea is demonstrated as the idea that surrounds the entire content of the text. While writing an essay or any text controlling idea includes the topic as it primarily functions to explain and justify it.

The author's viewpoint establishes the credibility of the controlling idea into the mind of the audience and it also functions to convey the intended message of the text that the author wishes to convey to the audience. The controlling or dominating idea of a text is comparable to the theme in a work of fiction as it does the same function to unify the various elements of the text like a theme does in a fictional work. Therefore, options A, C, E, and F are the correct answers.