This is the 459th most frequent Polish word.
dlaczego
"Why"
In this sentence, 'dlaczego' is used to ask for the reason or cause for choosing a particular field of study.
Dlaczego zdecydowałeś się na ten kierunek studiów?
Why did you choose this field of study?
Here, 'dlaczego' is employed to inquire about the cause or rationale behind not accepting an offer.
Chciałbym zrozumieć, dlaczego nie przyjąłeś tej oferty.
I would like to understand why you did not accept this offer.
In this case, 'dlaczego' asks for an explanation or cause for the stated situation.