Answer:
Narrative reviews, expert opinions, and textbooks are usually based on (3) Personal experiences.
Step-by-step explanation:
These types of literature, including narrative reviews, expert opinions, and textbooks, often draw on the personal experiences and insights of authors. While research studies and experimental data play a critical role in shaping scientific knowledge, these forms of literature tend to provide a more holistic view that incorporates the subjective perspectives and expertise of the authors. Personal experiences contribute to the narrative, interpretation, and contextualization of information, offering a nuanced understanding beyond statistical analysis.
In narrative reviews, authors may share their experiences and insights gained through extensive exposure to a particular field. Expert opinions, as the name suggests, heavily rely on the personal experiences and expertise of individuals who have substantial knowledge in a specific subject area. Textbooks, too, often integrate personal experiences to make complex concepts more relatable and comprehensible for readers.
Option 3 is correct.