Final answer:
The correct answer is C) Displaying a particular symbol. This misconception could arise because Salazar Slytherin, one of the founders of Hogwarts School of Witchcraft and Wizardry, was known for his affinity with snakes and his belief in the superiority of pure-blood wizards.
Step-by-step explanation:
The correct answer is C) Displaying a particular symbol.
In the world of Harry Potter, each of the four Hogwarts houses has its own symbol: Gryffindor has a lion, Ravenclaw has an eagle, Hufflepuff has a badger, and Slytherin has a serpent. Displaying the symbol of Slytherin, such as wearing a necklace with a serpent pendant or having a piece of clothing with a snake design, would make others think Harry was Salazar Slytherin's descendent.
This misconception could arise because Salazar Slytherin, one of the founders of Hogwarts School of Witchcraft and Wizardry, was known for his affinity with snakes and his belief in the superiority of pure-blood wizards.