The correct option is B False
At absolute zero temperature, all the electrons are in the valance band and thus there is no conductance in the intrinsic semiconductors. As we increase the temperature, some of the electrons gain energy and jump into the conductance band and so are responsible for the conductivity in the semiconductor. As we further increase the temperature, more number of electrons from valance band jump into the conductance band resulting in the increase in conductivity of intrinsic semiconductor. Thus the true statement is that the conductivity of intrinsic semiconductor increases with increase in temperature.