I believe it is C, an in-text citation because it isn't A since you've cited the source, it's not a full works cited like D, and it's not in quotes so it's not a direct quotation like B. Hopefully that helps you out!
C. Validity of the assignment
i think, either C or D. hope i could help :)
Answer:
C. Haven't
Explanation:
I figured this out by the process of elimination.
"They decided to have a wash <em>have </em>they." This sentence doesn't make sense because this is not the right word to fill in the blank.
"They decided to have a wash, didn't they." Also does not make sense because it is not the right type of past, present, or future tense.
"They decided to have a wash, haven't they." This is the only word that fits this sentence.