I believe it would be declarative because it is stating a fact.
Interrogative is a question and will allmost always end in a question marks.
Imperative is an order and will almost always end in a period.
Exclamatory shows excitement or concern ends most often with a exclamation mark.
Answer: washing our car
Explanation: because you dont need to always have a clean car so it wouldn't necessarily matter.
B. her's showing possession of something
