How is the concept of "iteration" defined in programming?

The concept of "iteration" in programming is best defined as the repetition of a set of instructions. This involves executing a particular block of code multiple times, often with some form of condition to determine when to stop the repetition. Iteration is commonly used in loops, such as for and while loops, allowing programs to efficiently handle repetitive tasks by automating the execution of the same instructions until a specified condition is met.

Understanding iteration is crucial for tasks such as processing items in a list, performing calculations repeatedly, or executing a function until a certain criterion is achieved. This makes option B the most accurate representation of iteration, as it captures the essence of what iteration entails in a programming context.