German phrase
Welche ~ soll ich verwenden?
Meaning
Which ___ should I use?
When to use it
Ask which option to use. It is useful when rules or instructions matter.
Example dialogue
Welche Zitierweise für die Hausarbeit soll ich verwenden?
Which citation style should I use for the paper?
Frag die Dozentin; sie sagt dir, welche Zitierweise verlangt wird.
Ask the lecturer; she will tell you which citation style is required.