Concept:An IF...THEN statement decides which instructions to execute based on a condition.
Explanation:IF...THEN checks whether a condition is true or false.
If true, the program runs the statements after THEN.
If false, the program skips them or runs another branch.
This changes the order in which statements are executed.
So it controls the flow of the program, not just stores a value.
It is not an assignment statement, an object, or a class.
Answer:D. a control structure