The correct answer is: B. Aniversary
The correct spelling is: Anniversary
Aniversary is a misspelling of the word anniversary. The word anniversary comes from the Latin word annus, meaning "year," and the suffix -versary, meaning "a coming around again." The word anniversary is used to refer to the date on which a significant event occurred in the past, such as a wedding or a birthday.
The word aniversary is not a real word. It is a misspelling of the word anniversary. The word aniversary is often used by people who are not familiar with the correct spelling of the word.