The correct option is B disproportionation reaction
Disproportionation is a specific type of redox reaction in which a species is simultaneously reduced and oxidised to form two different products.
3ClO−(aq)→ClO−3(aq)+2Cl−(aq)
+1 +5 -1
Here, Cl is oxidised as well as reduced.
So, its a disproportionation reaction.