Relative pronoun

[SARDORBEK]

He comes from a large family, all of … now live in Australia.
(a) who
(b) that
(c) which
(d) whose

Dear ALAN! I have seen this test in a book recently.
I think, there is no correct answer among versions, since after the preposition of we should use
“whom” in (a) , that’s to say - all of whom. If I chose (b) or (c) then the verb live would have
to end in “s”, mustn’t it? What would be the correct answer in this case?

[Alan]

(c)

Both 'which' and 'who' can be used in relation to 'family'.