What is the strongest continuation for Black?

Casual Game, https://itsyourturn.com
Wayne33 vs. John Coffey

1 2 3 4 5 6 7 8 h g f e d c b a +12

(black to move) 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bd2 c5 5. Bg5 Qa5 6. Qd2 cxd4 7. Qxd4 Nc6 8. Nh3 Nxd4 9. Rc1 Ne4 10. Bd2 Nxd2 11. Kxd2 Qxa2 12. Rc2 Nxc2 13. Kxc2 Bxc3 14. Kxc3 b5 15. e3 b4+ 16. Kd3 Qb1+ 17. Ke2 Qxb2+

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Pawn promotion:
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