Question

How does this sentence demonstrate an unusual use of syntax?

Answer 1

Here we can see some unusual use of syntax, as the sentence doesn't follow the "normal" structure of SVO (subject, verb, object). In this case, the answer is the third option, it follows a verb (danced ... away)-object (the night)-subject (the excited party-goers) format. Thus clearly the remaining options cannot be applied here in this example.