which one of the following will displace copper from a solution of copper sulphate? a- al b- Fe c-Mg d- all of these e- non of these

In general, any metal higher than copper in the "electromotive series" will displace copper from copper sulfate solution. This category includes all the alkali and alkaline earth metals and other common metals such as iron and zinc. 
So, all of these metal will displace copper from copper sulphate solution because all three are more reactive metals then copper.

3CuSO4(aq) + 2Al(s) ==> Al2(SO4)3(aq) + 3Cu2+(s) 

CuSO4(aq) + Fe(s) ==> FeSO4(aq) + Cu2+(s)

CuSO4(aq) + Mg(s) ==> MgSO4(aq) + Cu2+(s)

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In general, any metal higher than copper in the "electromotive series" will displace copper from copper sulfate solution. This category includes all the alkali and alkaline earth metals and other common metals such as iron and zinc.

For example Aluminum and Iron both displace Copper: 

Aluminum in Copper sulfate will trade places in the ionic balance of the solution and 'join' with the sulfate. 
CuSO4(aq) + Al(s) ==> AlSO4(aq) + Cu++(s) 
Because this single displacement reaction occurs in immediate proximity to the aluminum, Copper++ ions accumulate in a fluffy rust colored fur around the aluminum. 

Iron in Copper Sulfate will also go into the aqueous sulfate solution and the Copper will precipitate onto the Iron 
CuSO4(aq) + Fe(s) ==> FeSO4(aq) + Cu?(s) 
This reaction happens at the ferrous surface more intimately than the Aluminum and the Copper is deposited as a 'plate'.

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