The worldwide best selling fantasy series about the young wizard Harry Potter is written by which author?

Introduction / Context:
The Harry Potter series is one of the most famous and commercially successful fantasy book series in the world, and questions about its author are very common in general knowledge tests. This question checks whether the learner can correctly link the globally popular young wizard stories to their creator in modern English literature.

Given Data / Assumptions:

• The series mentioned is the fantasy series about the young wizard Harry Potter.
• The task is to identify the author of this entire series.
• Four options are provided, all being names of real world authors or author pairs.
• We assume familiarity with basic contemporary literature and best selling books.

Concept / Approach:
The concept tested is straightforward authorship recognition. Students should know that the Harry Potter series was written by a single British author who became famous worldwide through these books. The correct approach is to recall which of the options is associated with fantasy novels for children and young adults, rather than with journalism, literary fiction or non fiction history writing.

Step-by-Step Solution:
Step 1: Identify that the question refers to the full Harry Potter fantasy book series. Step 2: Recall that the author who created the character Harry Potter and wrote all seven main novels is J K Rowling, a British writer. Step 3: DBC Pierre is known for the novel Vernon God Little and is not related to Harry Potter. Step 4: Dominique Lapierre and Larry Collins are co authors of non fiction and historical works such as Freedom at Midnight. Step 5: Jhumpa Lahiri is known for works like Interpreter of Maladies and The Namesake, focusing on the Indian diaspora, not fantasy wizard stories. Step 6: Therefore, only J K Rowling correctly matches the description of the author of the Harry Potter series.

Verification / Alternative check:
Any basic reference to modern literature, library catalogues, book shops or even the covers of Harry Potter books clearly list J K Rowling as the author. A simple cross check in a school level library or online catalogue will confirm that she wrote the whole series from the first book to the last. This provides a strong and simple verification method.

Why Other Options Are Wrong:
DBC Pierre: Writes literary fiction with very different themes and has no connection with the Harry Potter universe.
Dominique Lapierre and Larry Collins: Joint authors best known for historical and political non fiction, not for a fantasy series for children.
Jhumpa Lahiri: A respected contemporary author, but her works focus on realistic stories of families and immigrants, not on magic and wizard schools.

Common Pitfalls:
Some learners may mix up modern authors due to unfamiliarity with their specific works, or may wrongly assume that a pair of authors wrote the series. Others might confuse J K Rowling with film directors or actors associated with the movie adaptations. It is important to remember that the books came first and that J K Rowling is the sole author of the original Harry Potter novels.

Final Answer:
The Harry Potter fantasy book series is written by J K Rowling.