Option B is the correct answer because “vitriolic “ means filled with bitterness and malice, which means he speaks bitterly about others.
“Alienated” means that he has gone apart from and isolated whoever has tried to have contact with him.
Option A is incorrect because “wanton” means deliberate and unprovoked, which might be correct, but the second part” immunised” means to make somebody immune to infection, which is incorrect.
Option C is incorrect because “pungent tongue” wan sthat his tongue smells bad, but here in the statement, his language as his tongue is being spoken about.
Option D is incorrect because “humanised” means he has converted them to humans, which is incorrect because he doesn’t have that power.