Specific resistance depends on the nature of material and also depends on temperature of material. For conductor, it increases with increase of temperature. Hence, statement I is incorrect. When wire of resistance R is increased to n times of its original length, then its new resistance R′ is given as. R′=n2R Here, n=4,R=6Ω ∴R′=42×6=96Ω Hence, statement II is incorrect and statement III is correct.