What is the strongest continuation for Black?

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

1 2 3 4 5 6 7 8 h g f e d c b a 0

(black to move) 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bd2 c5 5. Bg5 Qa5 6. Qd2 cxd4 7. Qxd4 Qxg5

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Pawn promotion:
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