Which interrogative pronoun should replace the blank space in the following sentence?: ___ will be helping us move the furniture?
Who or What
If people are going to help us move the furniture, then "who" is appropriate. "Who" refers to persons.
If a device (like a wheelbarrow or furniture dolly) will be helping us move the furniture, then "what" is appropriate. "What" refers to things.
Of the two, "who" is more likely.