The correct answer of the given question above would be option C. The sentence that is inverted with the subject underlined is: There was a big group here last night. (Group is underlined.) The subject of this sentence is the word "group".
The sentence that is in inverted order with the subject underlined is sentence C.
Explanation:
Sentence C contains an expletive <em>there. </em>In this case, there is not grammatically related to the rest of the sentence. Expletives serve a function but do not have any meaning. In fact, if the expletive was removed, the meaning of the sentence would be left unchanged (1). The expletive is also called a dummy subject.