I believe it is 'His hat matched the color of her dress,' because that is the only passive sentence.
I would say the correct answer is that has an undetermined answer.
If a subject has been thoroughly covered, then there is no need for this researcher to do it all over again. If it's impossible to answer, there is no need to try. If it can be answered easily, then it doesn't really require a research. This leaves us with the last option, because a researcher might want to try and determine the answer.
No, I don't think the animals did the right thing by getting rid of farmer Jones.
Ultimately the war was a struggle over how much power the parliament should have over the monarchy— so I’m thinking A? Sorry if I’m wrong.
S V IO PA PN/DO
My father gave me a new football.
Football acts as both a predicate noun and a direct object in this sentence.