To answer this question, you must know the gender of the noun papeles, and whether it is plural or singular.
Papeles is plural and it is masculine.
The options
- el - the (masculine, singular)
- la - the (feminine, singular)
- los - the (masculine, plural)
- las - the (feminine, plural)
Since our noun is masculine plural, the correct definite article is los.
Answer:
los
