That conclusion that can be drawn about a research article is that research articles can be difficult to read. Option C is correct.
A research article is written after carrying out a research in order to report the results, assesses its contribution to the body of knowledge in a certain area, and is published in a peer-reviewed scholarly journal. A certain academic field will likely have numerous peer-reviewed journals.
It is true that research articles can be difficult to read (although this is not always the case). The main reason for this is that research articles are usually conducted by experts in a particular field of study. And often, these researchers have their own jargon that is only known by members of the area. However, we can still read this articles if we are patient and we try to familiarize ourselves with some of the words that are commonly used in the area of study.
