Which breakfast cereal brand first used the slogan "They're Gr-r-reat!" in its advertising campaigns?

Advertising slogans are powerful tools that food companies use to create lasting brand impressions. Some food advertising catchphrases become so iconic that they remain in our cultural consciousness for decades. This trivia poll challenges you to match a famous slogan that revolutionized marketing in the breakfast cereal industry with its correct brand. Test your knowledge of food advertising history!

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Frosted Flakes (Kellogg's)
Honey Nut Cheerios (General Mills)
Cap'n Crunch (Quaker Oats)
Cocoa Pebbles (Post)