Passage Summary: Students succeed if they are taught well and work hard. The author concludes that if students aren't succeeding, it must be because they aren't being taught well.

Conclusion: If students at a specific school fail to master the curriculum, it is because they weren't taught with the right methods for their learning styles.

Reasoning: Mastery is guaranteed when both appropriate teaching methods and student effort are present.

Analysis: The author is making a logical error by ignoring one of the two necessary components for success. The premise says you need both methods and effort for mastery; the conclusion blames a lack of mastery solely on the methods. To make this argument valid, we must assume that the other factor—the students' effort—was actually present. Look for an answer that guarantees the students were putting in the necessary work.