If you are talking about the stain, then the stain is a noun. Hope it helped!
The stain will be difficult to clean is simply a example of B. Noun.
It should be noted that a noun simply means a part of speech that's used to represent a person, animal, place, or thing.
In this case, the stain will be difficult to clean is simply a example of a noun. Therefore, the correct option is B.
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