Children who attended private high schools may initially

Children who attended private high schools may initially feel that they can succeed without doing the work required, but as they grow older, they realise the necessity of serious study. each year the overwhelming majority of students disciplined for plagiarism and cheating on their exams is found in the freshman class.

The argument above would be most weakened if which of the foll. were true?
a. As they move up in grade students learn how o cheat without getting caught.
b. First time offenders in plagiarism and cheating on exams are not disciplined.
c. The proctors for freshman exams are least vigilant.
d. Acts of vandalism are most often committed by members of the sophomore class.
e. Public school students are no less likely than private school students to believethat they can succeed in life without working hard.