Which traditional cultural practice led to the development of KFC Japan's highly successful Christmas marketing campaign that generated over $1 billion in annual holiday sales?

In today's globalized marketplace, understanding how cultural traditions influence consumer behavior is crucial for successful product development and marketing. Different cultures have unique rituals, celebrations, and customs that significantly impact purchasing decisions and brand loyalty. This trivia question explores an interesting aspect of how traditional cultural practices have shaped modern consumer products.

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A traditional Japanese end-of-year gift-giving custom called Oseibo
The lack of turkey availability in Japan's food supply chain during the 1970s
A 1974 'Kentucky for Christmas!' campaign that positioned KFC as a substitute for traditional Christmas turkey
An ancient Shinto purification ritual involving white foods at winter solstice