The correct answer is option 2: increases.

In a tornado, the angular speed of a whirlwind towards the center increases. This can be understood by considering the conservation of angular momentum.

Angular momentum is a property of rotating objects and is given by the product of the moment of inertia (which depends on the mass distribution of the object) and the angular velocity (which represents how fast the object is rotating). According to the conservation of angular momentum, if no external torque is applied to a rotating object, its angular momentum remains constant.

In the case of a tornado, as the air mass gets pulled into the center, it experiences a decrease in radius. To conserve angular momentum, the angular velocity of the air molecules must increase. This means that the angular speed of the whirlwind in a tornado towards the center increases as the radius decreases.

Therefore, as the tornado intensifies, the rotational speed of the whirlwind increases.