Exercício: Pronoun question

Complete the following sentences with the correct sequence of question words.

I............is the best course of this university?
II........... far is your house from here?
III........... are you looking at?
IV........... don't you come with us?

a)What-Where-Who-How
b)What-Where-Whom-Why
c)Which-How-Whom-Where
d)Which-How-Whom-Why
e)Which-How-Who-When

GABARITO: D

DÚVIDA: No terceiro item (III) o correto não seria o pronome Who? Já que a construção para o pronome Whom adequada teria que ser "At whom are you looking"?