If you are telling us to revise the sentence, one error is that there is a double negative. 'not' and 'un' would cancel each other, and the revised sentence 'I wouldn't say he's the nicest guy around, but I've seen him behave kindly before.'
The correct answer is the first option - <span>The sentence is correct as written.
The word 'dancers' is plural, which means that the verb which agrees with that subject also has to be plural. In the original sentence, the verb 'continue' is plural, which is why it is the only correct option. All other options have singular verbs and are therefore incorrect.</span>
Yes it is a full sentence
