Going by elimination method to chose the right answer, no one can have other's private key, so this eliminates A, C straightaway.
Between B, D - B is correct as you would sign something with YOUR private key to show the other person that message came from you (by decrypting with your public key) thus confirming authenticity.
On Wed, Mar 19, 2014 at 9:30 PM, <[hidden email]> wrote:
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