Formal language is also called "proper language" because it is the type of language you would use when first meeting someone or giving a speech at a high class place so the correct answer is:
<span>B) Have I convinced you that the study of grammar is important and well worth your effort? </span>
Answer: Multimedia.
Explanation:
Multimedia presentation is a presentation that includes at least two different types of communication. In this type of presentation, information is given through text materials, photographs, audio or sound effects, video clips, etc. It enables us to present a particular topic in a more interesting way. As the technology has greatly advanced over the last few decades, there are multiple programs that support multimedia presentation today. Microsoft Office PowerPoint and Prezi are commonly used.
