Researchers took a group of teenagers who had never smoked and for one year
tracked whether they took up smoking and how their mental health changed.
Those who began smoking within a month of the study’s start were four times
as likely to be depressed at the study’s end than those who did not begin
smoking. Since nicotine in cigarettes changes brain chemistry, perhaps
thereby affecting mood, it is likely that smoking contributes to depression
in teenagers.
Which of the following, if true, most strengthens the argument?
A.Participants who were depressed at the study’s start were no more likely
to be smokers at the study’s end than those who were not depressed.
B.Participants who began smoking within a month of the study’s start were
no more likely than those who began midway through to have quit smoking by
the study’s end.
C.Few, if any, of the participants in the study were friends or relatives of
other participants.
D.Some participants entered and emerged from a period of depression within
the year of the study.
E.The researchers did not track use of alcohol by the teenagers.
可以請問一下a是哪裡支持嗎
其他選項錯的我都可以排除
但a我不知道對在哪裡
謝
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