Final answer:
The Monopoly property misspelled for over sixty years is Marvin Gardens, which should have been spelled as Marven Gardens after the real-life location in New Jersey. The correct option is d.
Step-by-step explanation:
The property in Monopoly which was misspelled for around sixty years is Marvin Gardens. The correct spelling of the location that this property is based on is "Marven Gardens," which is a historic residential community located in Margate City, New Jersey.
The Monopoly property was mistakenly spelled as 'Marvin Gardens' on the game board, and this error persisted for decades until it was corrected in the 1990s.
Hence, option d is correct.