Which innovative market research approach led to the most significant redesign of K-12 mathematics textbooks in the past decade?

In the world of educational publishing, mathematics textbooks have undergone significant marketing transformations to better engage students and educators. One revolutionary approach dramatically increased adoption rates and changed how mathematical concepts are presented to students. This poll tests your knowledge about a landmark market research innovation in mathematics textbook publishing that occurred in the last decade.

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Eye-tracking studies that identified which visual presentations of mathematical problems resulted in better comprehension and retention
Social media polling of students' preferred mathematical topics, leading to textbooks organized by popularity rather than logical progression
Neuroimaging research showing which mathematical fonts and colors stimulated the highest brain activity in students
Gamification surveys where students ranked mathematics concepts based on entertainment value rather than educational importance