友達に本を貸して___。 (I lent a book to my friend.)

Answer and explanation

Correct answer: A. あげました

て-form plus あげる means to do a favour for someone.
Answer: あげました.
Why not the others: もらいました: that would mean the friend lent me a book. くれました: that would mean the friend lent to me. くださいました: that is an honorific form for a superior.

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