This is the 376th most frequent Spanish word.
cuales
"Which ones" or "which" (plural).
Here, 'cuales' is used as an interrogative pronoun to ask for clarification or specificity among options.
¿Cuáles son tus libros favoritos?
Which are your favorite books?
'Cuales' functions here as a relative pronoun, introducing a dependent clause to provide additional information about the 'asuntos.'
Esos son los asuntos sobre los cuales debemos trabajar.
Those are the subjects on which we must work.
In this case, 'cuales' is used as an interrogative pronoun within reported speech to indicate uncertainty or inquiry about specifics.