
An author is someone who creates written work, particularly books, articles, or other written content. An author is primarily responsible for the original content and has rights over the material. In contrast:
Therefore, the term that specifically identifies a person who writes books is author.
Fill in the blank with the correct option. 
The teacher believed that the student’s sudden lack of interest in class was an ..........., as he had always been enthusiastic and attentive.
What comes next in the series? 
\(2, 6, 12, 20, 30, \ ?\)