Answer:
Second Option: it suddenly drops to zero
Explanation:
Superconductors are resistance free materials that enable (allow) electricity conduction (i.e. electron transportation between atoms).
As the superconductor temperature is gradually lowered, eventually a Critical Temperature is reached, where the superconductor electrical resistivity suddenly drops to zero. Such drop is so fast, that can be described as a complete matter-phase transition. This is in contrast with typical conductors, where with gradually decreasing temperature there is also a gradually decreasing resistivity (which is also true at temperatures of near absolute zero).
Thus the correct answer is the Second Option: it suddenly drops to zero
