Answer:
D. It is important message of a text.
Step-by-step explanation:
Any text most often contains one main point or idea of what the whole text or passage will be dealing with. In other words, a text will often contain a recurring idea that will be the basis of the whole text.
The main idea of a text is the most important message or issue that the author wants to convey to the readers. It can also be the main point that the whole text or passage is all about.
Thus, the correct answer is option D.