Answer:

D. Formal

Explanation:

Academic writing is just like the formal writing style which is used in scholarly publications and universities. In academic writing, the academic writers have to write research papers, essays and dissertation which should be in academic styles. This is not the easy form of writing and so many of the companies have come forward to provide academic help to the students.

There are many features of academic writing but before we get into that let's see some of the principles of academic writing. First, academic writers have to use the right structure for language along with a clear writing style. They also have to follow the proper writing style for academic writing. These are some of the basic concepts that you have to stick into if you are writing for academic purpose.