Can workflow do this?

Hi,

Say I have a work flow item that's sent to the SAP inbox of A, B and C. A opens the item and the item disappears from the inboxes of B and C. A then decides not to work on the item anymore, that is, he wants to let B or C work on the item instead. What's the best way to do this? Is there a function in work flow design that allows A to cancel the item and the item will appear in the inboxes of A, B and C again?

Any advice is appreciated. Thanks.