Answer:
D. Opinion Paper
Step-by-step explanation:
The option that fits the description in the question is an option paper because it relies on what the author thinks and the author's opinion on a particular subject.
However, a research paper requires a well detailed research and sources must be referenced while an essay paper is a mix of research and the author's opinion on the subject.
Meaning that, an essay is not totally based on opinion, neither is it totally based on research.
There is no term like an ungraded paper.
So, option (d) is correct.