The “helping words” are missing so I believe this line is a Metaphor.
Switching from chains to cables in the building of roller coasters was important because cables are less likely to snap when hauling several tons of roller coaster cars full of people. Chains are made of linked, welded pieces of metal that can easily snap if they pull too much. Cables, while they can snap, are much less likely to do so, because they're a stretch of fibers, be it metal or other, without any potential weak spots.
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>
