question number 34.

Dear Student,
Mobility of charge μ, responsible of current is defined as the magnitude of drift velocity of charge per unit electric field applied i.e.
                                            μ = v​d/E
So, if electric field gets doubled the mobility reduced to half.
                                          μ = vd/2E
Hence, mobility of the electrons depend on the applied electric field. 
As temperature increases relaxation time decreases
we have  ,μ=eτm                 e= charge, τ=relaxation time, m=massμ=eτm                 e= charge, τ=relaxation time, m=mass
mobility is directly proportional to relaxation time. Relaxation time decreases hence mobility decreases.
Hence, mobility of the electrons also depend on the temperature. 
Therefore, option c is correct. 

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