Which are not accepted in formal written English?

Irregardless of the outcome of the competition,our schools will remain allies A.Irregardless

Irregardless of the outcome of the competition,our schools will remain allies A.Irregardless C. will remain B.of the competition D.no error

or:Irregardless of the outcome of the competition,our schools will remain allies A.Irregardless C. will remain B.of the competition D.no error

or:A. While irregardless is technically a word, it is incredibly uncommon in written text. \"Regardless\" is a better choice.

Tags:competition,formal,written,