Sorry,I have lent _____ to John.Here is Jack's.You can use t

Sorry,I have lent _____ to John.Here is Jack's.You can use this one.
--Excuse me.May I use your dictionary?
--Sorry,I have lent _____ to John.Here is Jack's.You can use this one.
A.my B.mine C.me D.ours
请在写出选项的基础上写出为什么选此选项!