What significant change did McDonald's make to their French fries in 1990 after extensive consumer research and testing?

McDonald's has become one of the world's most recognizable food brands, with products that have evolved significantly over time. This poll tests your knowledge about one of their most famous menu items and how market research completely transformed it. Understanding product evolution based on consumer feedback is critical in the food industry, where taste preferences and health concerns constantly shift market dynamics.

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They switched from animal fat to vegetable oil for frying
They reduced the salt content by 50%
They introduced a proprietary potato variety grown exclusively for the chain
They changed from hand-cut to machine-cut fries for consistency