<span>The question is asking us to choose, from a list, which activity can substantially increase the activity level of a person lifestyle. The activity here is the physical activity, so the question is, which of the following would make you most physically active. The answer is walking to school - here you would be using your muscles to move. When you are driving a car or using an escalator, you are using technology to move so you don't have to use physical strength.</span><span />
