Fill in the blank with the most appropriate word.
A: There is someone at the door.
B: __________ it is, I don't want to see them.
If we add -ever to wh-words like how, what, which, when, where and who, we change their meaning.
Whichever is used for specifying about things, ‘it doesn’t matter which’
Whoever is used to specify people, ‘it doesn’t matter who’
Wherever is used in case of places, ‘it doesn’t matter where’
Whatever is used for things, ‘it doesn’t matter what’
This sentence mentions about a person. Option B is correct.