The Tragedy of Romeo and Juliet is about two noble families who despise each other, the Montagues and the Caplets. Two children fall in love with Romeo being a Montague and Juliet being a Capulet. This is a forbidden romance. <span />
I would say the answer is D, as it means that if you loan something to someone with good intention they will use it gratefully and it will come back sharper than it was.