Final answer:
The correct answer is option (1). Don Featherstone invented the pink plastic lawn flamingo in 1957, and it has since become an iconic American lawn ornament.
Step-by-step explanation:
The inventor of the pink plastic lawn flamingo in 1957 was Don Featherstone. The pink flamingo has become a recognizable icon of American lawn decor since its creation.
Don Featherstone designed this popular ornamental figure while working for Union Products, a company specializing in plastic lawn decorations.
His design later gained cult status, often associated with kitsch and suburbia in American culture. Featherstone's signature appears on the flamingo's underside, making it possible to distinguish the original flamingos from later imitations.
This design earned Featherstone a place in pop culture history, with the beloved flamingo gracing many lawns throughout the United States and beyond.