The following is an abstract, consisting of 5 sentences. Which element does Sentence ①describe?Abstract: ①Procrastination is variously described as harmful, innocuous, or even beneficial. ②Two longitudinal studies examined procrastination among students. ③Procrastinators reported lower stress and less illness than nonprocrastinators early in the semester, but they reported higher stress and more illness late in the term, and overall they were sicker. ④Procrastinators also received lower grades on all assignments. ⑤Procrastination thus appears to be a self-defeating behavior pattern marked by short-term benefits and long-term costs.