Final answer:
The correct completion for the quote from 'The Princess Bride' is: 'You killed my father, prepare to die!' The line is spoken by the character Inigo Montoya.
Step-by-step explanation:
The correct answer to the question "Hello, my name is Inigo Montoya! You ___________, prepare to die!" is A. killed my father. This line is from the movie The Princess Bride, where the character Inigo Montoya is seeking revenge for his father's death at the hands of a six-fingered man. The complete line delivered by Inigo is famously known as: "Hello, my name is Inigo Montoya. You killed my father. Prepare to die." This iconic phrase has been widely recognized and referenced in popular culture.