Conclusion - if the program had been successful, the dropout rate for female students would not have increased substantially in 2001.
We need to weaken this, or prove that even if the program had been successful, the dropout rate for female students would have increased substantially.
A. the number of female students in the school has remained constant for the past decade - implies that the number of female students remained the same, and the incidence did not increase because the number of female students had increased. If anything, this strengthens the conclusion.
EliminatedB. nationwide, the teen pregnancy rate and the female high school dropout rate both increased significantly in 2001 - we're not concerned with what happened nationwide, but if anything, this strengthens.
EliminatedC. some female students who dropped out were pregnant at the time - but we don't know if they dropped out
because they were pregnant. And it doesn't do anything to weaken the conclusion.
EliminatedD. many female high school dropouts said that poor economic conditions forced them to leave school and find jobs - effectively addresses the cause and effect in the conclusion. The cause of the increased dropout rate was economic conditions, not pregnancy. Therefore, even if they program had been successful, the dropout rate would've still increased.
CorrectE. the school also implemented a program designed to reduce the incidence of drug use among teenagers in 2001 - out of scope.
Eliminated