Answer: storesDF.collect()

The question asks which code blocks return all rows from the DataFrame. Let's analyze each option: - **A. storesDF.head()**: Returns the first row (or first n rows if a number is provided). Without a parameter, it returns only the first row, not all. - **B. storesDF.collect()**: Collects all rows from the DataFrame and returns them as an array (Array[Row]). This retrieves all data to the driver. - **C. storesDF.count()**: Returns the total number of rows, not the rows themselves. - **D. storesDF.take()**: Requires an integer parameter (e.g., take(n)). The code as written is invalid and will cause an error. - **E. storesDF.show()**: Displays rows (default 20) in the console but returns **void** (no value). It does not return the rows as data. Only **B (collect())** returns all rows as part of its output. While **show()** prints rows, it does not return them, so **E is incorrect**. Thus, the correct answer is **B**.

Author: LeetQuiz Editorial Team