JS Returns Undefined

The animations are really confusing to say the least. After you click an option, it reads "next question" down there, but you are not supposed it click it cause you are automatically redirected to the next question. And it seems there's a time limit for each question without any indicative of so, that triggers another animation and since each question is so similar to the previous, I was jump scared by the pentagon shaking and suddenly I'm on a diferent question.