"Ninyi mnafanya" is also correct and should be accepted. But "ufanya" should not be accepted
"Unafanya" was offered in multiple choice and marked as correct. It should NOT be accepted as correct, "you all" clearly indicates plural!
Indeed, "unafanya" was the answer I was supposed to pick for multiple choice.
Yes I agree with this
Can ninyi wanafanya be used
No, because that would translate to “You all they are doing.”
I guess no because wa- is used for "they"