The correct option is C comproportionation reaction
A reaction is said to be intermolecular redox when two substances react in which one is a reducing agent and the other is an oxidizing agent.
A reaction is said to be an intramolecular redox when one element of the same compound gets oxidised and another element gets reduced.
A reaction is said to be a comproportion reaction when two reactants containing the same element but with different oxidation numbers react to form a product in which that element achieves the same oxidation number. This is the case for the above reaction. Ag in reactants have two different oxidation numbers but in products it has the same oxidation number.