If excess zinc is added to a bluish green solution of copper (II) sulphate, and the excess zinc filtered off after completion of reaction, a colourless solution is obtained because

• A.both zinc and copper are metals
• B.the sulphate radical and the zinc ion are divalent
• C.zinc is more electropositive than copper
• D.both zinc and copper form depositive ions in solution
• E.zinc is a reducing agent