'Which of the cars' vs. 'Whom of the cars'

[Delsey]

English Grammar Tests, Elementary Level

ESL/EFL Test #100 "Interrogative pronouns", question 9

......... of the cars is parked in the driveway?

(a) Which
(b) Who's
(c) What
(d) Whom

English Grammar Tests, Elementary Level

ESL/EFL Test #100 "Interrogative pronouns", answer 9

Which of the cars is parked in the driveway?

Correct answer: (a) Which

Your answer was: incorrect
Whom of the cars is parked in the driveway?
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why should we choose which?

Delsey

[Alan]

Hi Delsey,

Here you need the interrogative pronoun which meaning which particular one out of the number of cars parked.

Alan
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English as a Second Language
You can read my ESL story Relative Pronoun