A: Loss of electrons

B: Gain of electrons

C: Increase in the valency of negative part

D: Decrease in the valency of positive part

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Explanation: 

  • Oxidation is the process in which there is an increase in oxidation number of the central atom of a compound or element . 
  • It involves gain of oxygen or loss of electrons.

Final answer: 

Hence, correct option is A, i.e. loss of electrons.

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