Treatises are

A) formal scholarly works.
B) secondary sources.
C) single books.
D) multivolume sets.
E) All of these choices are correct.

Treatises

Comprehensive written works on particular subjects, often involving scholarly text and aimed at providing in-depth information and analysis.

Secondary Sources

Information or analysis derived from the synthesis or interpretation of primary sources, often used for research, critique, or contextual understanding.

Scholarly Works

Scholarly works refer to academic publications or studies, often peer-reviewed, that contribute to a particular field's body of knowledge.