What is the primary purpose of using nested loops in Karel's movement programming?

The primary purpose of using nested loops in Karel's movement programming is to allow Karel to perform complex movements efficiently and effectively. Nested loops enable Karel to iterate through a set of instructions repeatedly for different iterations, which is essential when Karel needs to navigate through multi-dimensional spaces, perform tasks in layers, or repeat actions multiple times while changing direction or context.

For instance, a nested loop can facilitate scenarios where Karel moves in a rectangular pattern to complete a task that involves both vertical and horizontal movements. Instead of writing separate commands for each movement, the nested loops help encapsulate the logic, resulting in more elegant and organized code that can handle complex tasks with fewer lines of code. This is particularly useful in programming environments, like Karel's, where the physical world is often represented in grid-like patterns and repetitive tasks are common. Thus, option B accurately reflects the capability of nested loops in Karel's programming tasks.