Question

how will each set of articles in this unit differ? one article will use primary sources; the other article will only use secondary sources. one article will share one perspective on a given topic; the other article will share an opposing or different perspective one article will be written by an american author; the other article will be written by a canadian author. one article will be written by a male author; the other will be written by a female author.

Explanation:

This is the standard structure for comparative article units in academic settings, where paired articles are designed to present contrasting viewpoints to encourage critical analysis and discussion of a topic. The other options focus on arbitrary differentiators (source type, author nationality, author gender) that are not the typical framework for such a unit's article sets.

Answer:

One article will share one perspective on a given topic; the other article will share an opposing or different perspective.