'In which way' instead of in 'what way'

[Peter]

English Grammar Tests, Elementary Level

ESL/EFL Test #61 "Chit Chat: In the supermarket", question 3

Employee: Of course. In what .........?

(a) direction
(b) path
(c) road
(d) way

English Grammar Tests, Elementary Level

ESL/EFL Test #61 "Chit Chat: In the supermarket", answer 3

Employee: Of course. In what way?

Correct answer: (d) way

Your answer was: correct
_________________________

Am I wrong if I say "In which way" instead of in "what way"?

Thanks
Peter

[Yankee]

Hi

The word which does not work well here because we use the word which when the possible choices (ways) have already been defined or limited.