A cognitive psychologist has claimed that intelligence is the ability to figure out how things work in order to overcome obstacles.
Conclusion (clearly then)
The cognitive psychologist's definition of intelligence is inadequate.
rephrase: Intelligence is not the ability to figure out how things work in order to overcome obstacles.
Evidence
In a situation where someone acquired an understanding of how things work, we'd say they were intelligent, regardless of whether they acquired that knowledge in order to overcome an obstacle.
Evaluate
The three most common moves on Method are Analogies, Faulty Implications, and Alternatives.
This somewhat has Faulty Implications vibes, because the author is essentially saying:
If your definition was correct, then someone who acquired an understanding of how something works just for the sake of learning it (not in order to overcome an obstacle), would not be considered intelligent.
However we DO consider those people intelligent.
Thus, your definition is wrong.
Goal
The author is showing that the definition is wrong because it isn't broad enough to encompass cases of intelligence that don't involve overcoming obstacles.
Find any answer that says something descriptively true.