The correct answer is option 2: A very low pressure center. A tornado is a violent and destructive rotating column of air that is in contact with both the surface of the Earth and a cumulonimbus cloud. It is characterized by a strong updraft and a narrow, funnel-shaped cloud that extends downwards from the base of the cloud. Tornadoes are formed from severe thunderstorms and are typically associated with a strong low-pressure system. The low pressure at the center of the tornado creates a vacuum-like effect, which causes the surrounding air to rush inwards at high speeds. These strong winds, along with the rotation of the storm, can cause significant damage to structures and can be extremely dangerous.