"¿Cuál es tu comida preferida?"
Translation:What is your favorite food?
Why? Because Duo's preference is favorite. Preferred is the better translation, after all, Spanish does have a word for favorite. ¿Cuál es tu comida favorita?
Check a dictionary. The English translation of the Spanish word preferido is favorite. In Spanish, favorito and preferido are interchangeable.
Yes, preferred is a better translation here. Remember everyone, if you are relatively sure it should be accepted simply report it. No need to down-vote the sentence or add multiple comments on it. This just clutters things up. I believe these are relatively newly added sentences so the data bank for accepted answers is not large. Reporting correct answers will help with this.
What is the deal with this series of questions rejected 'preferred' when asked to translate 'preferido'? Someone dropped the ball big time when they programmed in the valid translations.
Now accepted: "which is your preferred food" Remember folks, don't complain when you know you are right. Just let Duo know in the "Reply" feedback :) They DO listen...