Can anyone solve this equation? If yes , lets brain storm.

If mr A give mr B 15 oranges and mr A requested for 7 orenges out of the 15 he gave to mr B , he licked two out of the 7 oranges he collected back from mr B ,then gave the remaining five back to mr B.
Question
How many oranges did mr A gave to mr B?

Optin
A . 8
B. 15
C. 20
D. 13

Please contribute in this brainsturming. And let have fun together.