The article is mostly organized using description and comparison. How would the article be different if it were organized using chronology?

A
It would describe what is included in "implied powers" and discuss why the Constitution grants these powers.
B
It would go into more detail about a situation in which a federal law went against the Constitution.
C
It would describe the origins of federalism and discuss how Article I and the Tenth Amendment came to be.
D
It would go into more detail about the similarities and differences between the federal government and state governments.

The authors of the paper "fudging the numbers: distributing chocolate influences student evaluations of an undergraduate course"† carried out a study to see if events unrelated to an undergraduate course could affect student evaluations. students enrolled in statistics courses taught by the same instructor participated in the study. all students attended the same lectures and one of six discussion sections that met once a week. at the end of the course, the researchers chose three of the discussion sections to be the "chocolate group." students in these three sections were offered chocolate prior to having them fill out course evaluations. students in the other three sections were not offered chocolate. the researchers concluded that "overall, students offered chocolate gave more positive evaluations than students not offered chocolate." indicate whether the study is an observational study or an experiment. give a brief explanation for your choice.