Answer:
The correct answer is b. research articles.
Research articles are an example of a secondary source of collecting data used in academic writing. Secondary sources are sources of information that analyze, interpret, or summarize primary sources. Research articles are written by scholars who have conducted their own research using primary sources, and they report on their findings and analysis. In academic writing, secondary sources like research articles are often used to support or expand upon an author's argument or to provide additional context or background information.