Which preposition pairs with "sich bedanken"?

For example, the sentence "Sie bedankt sich für den Brief."

The verb "bedanken" is a reflexive verb in German, meaning it is used with a reflexive pronoun. In this case, "sich bedanken" is used to express the act of giving thanks. The correct preposition to use with "sich bedanken" for conveying the meaning of "to thank for" is "für". Therefore, the sentence "Sie bedankt sich für den Brief" translates to "She thanks [herself] for the letter," more naturally expressed in English as "She gives thanks for the letter" or "She is thankful for the letter." The use of "für" is crucial in this context to indicate what the person is thanking for.