Final answer:
An iteration or a sequence is an example of a Control structure (B), which in programming refers to mechanisms that manage the flow of execution, such as loops for iterations.
Step-by-step explanation:
An iteration or a sequence is an example of a Control structure. In programming, control structures allow you to control the flow of execution of statements. An iteration, specifically, refers to repeating a block of code multiple times, which can be achieved using loops such as 'for', 'while', or 'do-while'. A sequence, on the other hand, typically refers to a series of steps or instructions that are executed in order, which is the default control flow in most programs without any explicit control structures impacting the sequence. So, for the provided options, the correct answer is (B) Control structure.
Iterations and control structures are fundamental concepts in programming that allow developers to implement complex logic and algorithms. By repeatedly executing a set of instructions, iterations make it possible to automate tasks, process collections of data, and much more. Understanding how to use control structures effectively is essential for any programmer or student of computer science.