A. A source that provides secondhand information
B. An original document or firsthand account
C. A summary of existing research
D. A textbook
Answer: An original document or firsthand account
A. A source that provides secondhand information
B. An original document or firsthand account
C. A summary of existing research
D. A textbook
Answer: An original document or firsthand account
Additional Information: Primary sources include original research, interviews, and historical documents that provide direct evidence.
Subjects: Essay Writing, Writing Skills