Which breakfast cereal brand has used the famous tagline "They're Gr-r-reat!" since the 1950s?

Test your knowledge of iconic food advertising with this challenging tagline trivia! Behind every successful food brand is a memorable slogan that's helped it become a household name. Some taglines have become so embedded in our culture that they're instantly recognizable, while others might be more elusive. This question focuses on a famous breakfast cereal's long-running tagline that helped transform morning routines across America. Can you match the famous slogan to its brand?

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Frosted Flakes
Lucky Charms
Cheerios
Cap'n Crunch