Which historic advertising innovation in the 1880s revolutionized product marketing by introducing the concept of 'brand personality' through character mascots?

The history of product advertising has seen remarkable evolution over centuries. Before mass media, before digital marketing, even before the industrial revolution - certain breakthrough advertising techniques changed how products were marketed forever. This trivia question focuses on a pivotal moment in advertising history that transformed how companies approached product marketing and created the foundation for modern advertising strategies we still use today.

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Aunt Jemima's pancake mix featuring the first character spokesperson (1889)
Singer Sewing Machine's illustrated catalog with customer testimonials (1885)
Pears' Soap full-page newspaper advertisements with celebrity endorsements (1887)
Montgomery Ward's money-back guarantee promotion (1884)