Passage Summary: Maria won a sailboat race against a long-time champion, so the speaker thinks she must have put in a lot of training.

Conclusion: Maria must have trained rigorously to win the race.

Reasoning: Maria defeated Sue, who had won the previous four years.

Analysis: Maria's victory is impressive, but the author is making a huge leap by assuming hard work was the only way she could have pulled it off. Maybe she's a natural, or maybe Sue had a really bad day and crashed into a buoy. To make this argument bulletproof, we need a premise that guarantees training is the necessary ingredient for beating a champion. Look for an answer that bridges the gap by stating that anyone who beats a four-time winner necessarily trained hard.