The following is an abstract, consisting of 5 sentences. Which key element does Sentence ② describe? Abstract: ①Anxiety about tests and test-like situations was examined in a series of studies of elementary school children in 4 Connecticut towns. ②High anxiety (HA) and low anxiety (LA) groups were identified by General Anxiety and Test Anxiety scales for which format and validation details are presented. ③Data support hypotheses concerning fantasies of bodily injury and cues which interfere with the anxious child's performance. ④Ratings by fathers of a portion of the sample discriminated between HA and LA children; mothers' ratings did not. ⑤Implications for school testing programs are discussed
A.the methods B.background information C.the main conclusion D.the key results or findings