Here the given paragraph is about "an assignment".
Answer: Option D
Explanation:
Randomization have two terms basically selection & assignment. The method of drawing the pool of individuals from a population for the given study is termed as "Random selection". While the method of performing research, allocating the sample one draw to different groups or treatments is understood as "Random assignment".
The research assignments involve tasks for creating a research question which must be followed by sources means bibliography and writing part involves an introduction, a statement of thesis and a conclusion.