The Temperature of a Semiconductor Rises
Option 2 is the right answer
Resitivity is a measure of the resistance to electrical conduction for a given size of material.
Restivity is affected by temperature – for most materials the resistivity increases with temperature. An exception is semiconductors (e.g. silicon) in which the resistivity decreases with temperature.
In general, intrinsic semiconductor resistivity decreases with increasing temperature. The electrons are bumped to the conduction energy band by thermal energy, where they flow freely, and in doing so leave behind holes in the valence band, which also flow freely.