During ionization metals lose electrons, this change can be called
Oxidation
Explanation for the correct option:
Step 1:The process which involves the loss of electrons is called Oxidation.
Since oxidation is the loss of electrons. This option is correct.
Explanation for the incorrect options:
Step 2: Reduction
Since it is the gain of electrons. This is not the correct option.
Step 3: Redox
It includes both loss and gain of electrons. So it is not the correct option.
Step 4: Displacement
This does not involve any loss of electrons. So this is not the correct option.
Hence, option (a) Oxidation is correct.