The correct option is A Ag+ can act as an oxidising agent while Ni can act as a reducing agent
In the given problem,
E0Ag+/Ag=+0.8 V
E0Ni2+/Ni=−0.25 V
Here, E0Ag+/Ag>E0Ni2+/Ni
So, Ag+ acts as an oxidising agent and Ni2+ acts as a reducing agent.
Metals which have high reduction potential will have more tendency to get reduce and exist in metal form. Hence, they are unreactive metals.
Metals which have less reduction potential will have more tenducy to get oxidise and exist in ionic forms. Hence, they are highly reactive metals.
Since, Ni is the reactive metal, it can displace Ag from AgNO3
So, correct answer is option A.