The correct answer is "attackted"
Explanation:
In language, a nonstandard word refers to a word that is not usually used or that does not follow the conventions and standards in terms of spelling, pronunciation or grammatical form. Additionally, nonstandard words can still be valid and in many cases dialects or other forms of language include them. In the case fo the sentence "The navy attackted the submarine" the word that can be classified as nonstandard is "attackted" because the standard form for this word is "attacked" which means the word presented does not follow the conventions or standards of English language and therefore is a nonstandard word.
