Answer:
A). The author’s knowledge.
C). The author’s opinion.
D). The author’s worldview.
E). The author’s experience.
Explanation:
The author's viewpoint is described as the way an author views or perceives a literary text and presents it to the readers that assists them to perceive the given content and understand it more comprehensively. However, such point of view may propose a biased dimension due to the reflection of the author's personal opinions, perceptions, views, or experiences.
As per the question, the factors that would influence the author's opinion would be 'the author's previous or current knowledge', 'the author's opinion or perceptions', 'his/her worldview', and 'his/her experiences' as these would clearly be reflected in any kind of work created as these characteristics represent an individual and his thoughts or observations. Thus, these factors would deeply influence the author's viewpoint. Therefore, options A, C, D, and E are correct.