Answer:
Critics of the mayor often gibe about his less-than-perfect articulation of ideas. (?)
Step-by-step explanation:
(this is the plausible answer)
I am not 100% on this, however, I do believe it's B simply because it's used as a verb in this sentence like the definition says,
and gibe used as a noun would be ' an insulting or mocking remark; a taunt. '
Although the usage for both noun and verb are confusing, I hope my answer helps!