Which Arduino function runs repeatedly after setup in a continuous loop?

• A. setup()
• B. loop()
• C. delay()
• D. start()

Answer: (B)

After an Arduino board starts up, setup runs once to initialize pins, variables, and peripherals. Once setup finishes, the loop function runs repeatedly, allowing you to perform ongoing tasks like reading sensors and driving outputs. This continuous calling of loop creates the persistent behavior you expect in an Arduino program. A delay pauses execution for a time but doesn’t create repetition by itself, and start isn’t part of the standard Arduino program flow. So loop is the function that runs over and over after setup.