Yes , its correct . Answer 1 also can being used
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>
In my opinion, b. visible already means it's clear to the eye, hence 'to the eye' should be eliminated! :)
The correct choice would be A. mower's.
When you say mowers, that would indicate that you are talking about more than one mower because it is in plural form. When you say mowers's, that would indicate that you are referring to more than one mower. Mowers's is incorrect because you say lawn mower and not lawn mowers, unless you are talking about more than one mower.