Please help! Big troubles with CR.

Dear Colleagues.

Please help me with the understanding of CR.

I’m not a native speaker. My problem is that I cannot predict what the assumption should be in the Assumption questions, or what specifically I should strengthen or weaken in the respectful types of questions.

I know the strategies for a different types of questions, I can almost every time identify what is the conclusion and what is (are) premises (evidence), but I flatly cannot understand (or predict) what the answer should be.

After POE usually leave 2 or 3 answers, that require understanding, but I cannot understand. Very simple example from Kaplan to show my problem:

In 2001, a local high school implemented a new program designed to reduce the incidence of teenage pregnancy. The program, however, failed to produce the desired result. If the program had been successful, the dropout rate for female students would not have increased substantially in 2001.

The argument in the passage depends on which of the following assumptions?

A. The number of teen pregnancies nationwide increased in 2001.
B. The number of teen pregnancies in 2001 was greater than the number of teen pregnancies on 1991.
C. Teenage pregnancy is a leading reason that female students leave school.
D. The program was mandatory for all female students.
E. Most 2001 female dropouts were not pregnant at any time during the year.

(Of cause this Q can be done with POE and scope, but not all Qs are like these).

Conclusion: a 2001 school program to reduce teenage pregnancy was a failure.
Evidence: female dropout rate increased during 2001.

Even if I try to think like KISS – I still cannot understand how to assume that “pregnancy is important reason for a female to drop out of schoolâ€