Informal is defined as relaxed, unofficial, or easygoing. If this is a multiple choice question, consider what choices are formal versus informal. <span>Anything that would fall under the category of "formal," which can also mean academic, rigid, proper, precise, or strict, can be ruled out as wrong answers. </span>Things that would be "formal" include tones, or the way that the story is written, that are very rigid and academic. In addition, a list of facts presented one after the other would be formal, not informal. Once you are done ruling these formal answers out, you will know what is informal.
Answer: C. The design of the Boeing 787 Dreamliner has also taken noise pollution into account, and boasts noise-reducing chevrons on its engine housings.
The theme of a story is important because a story's theme is part of the reason why the author wrote the story. The author has a message he wants to share with readers, and he uses his story as a way to get that message across.
