This is the 111th most frequent Spanish word.
cual
"Which" or "what" (used to indicate choice or selection).
The word 'cuál' introduces a direct question asking for a choice or preference among options.
¿Cuál es tu color favorito?
Which is your favorite color?
The word 'cuál' refers here to a specific noun previously implied or mentioned.
No recuerdo cuál fue la razón de su decisión.
I don't remember what the reason for their decision was.
The phrase 'en la cual' works as a relative pronoun linking the clause to the preceding noun.