Alright, so this is simple
Ab adverb is a word or phrase that modifies an adjective, or a verb, basically an action word.
The verb in this is "Performed"
So, we can see that the phrase that modifies it, also known as an "Adverb Phrase" is "with great skill"
You could say "She performed the action"
Or you can modify it with, "She performed the action with great skill."
Your answer is C, "The sentence has an adverb phrase that modifies performed"