What is the control variable in this sentence drinking energy drinks makes people more aggressive

Baldwin uses numbered headings as text structures to organize his article. briefly summarize what is covered in each numbered part. why are these divisions logical?

Based on the author’s description of long island, the reader can infer that this novel willrelate events about unconventional individuals.relate events that occur directly within the city of new york.relate events that are supernatural and terrifying in nature.relate events having to do with highly privileged individuals.

Which statement is most clearly objective?