What type of data is:

किस प्रकार का डेटा है:

 arr = [[1,2,3][2,3,4,5]]

list of tuples

Tuples of lists

List of lists

Invalid type

Explanation:

The correct code should be:

arr = [[1, 2, 3], [2, 3, 4, 5]]

This creates a list of lists. Each element inside the outer list is another list.

Answer: (C) List of lists