In the given sentence "Los padres siempre piden a sus niños mucha tarea (chores)," the appropriate word to fill in the blank is B. les.
- The verb "piden" (ask) is conjugated in the third person plural form, which indicates that the subject (parents) is asking something from a third party (their children).
- In Spanish, when the direct object is a person or group of people, the indirect object pronoun "les" is used to indicate "to them" or "for them."
- Therefore, in this sentence, "les" is the correct pronoun to use to show that parents are asking their children (a group of people) to do a lot of chores.
