It confirms a down movement from D (11000) in the direction of C.
Trading a Gartley: IF the price breaches B and then reaches (almost or sometimes by a wick) D the trader will go short (a short order is triggered) and take profit at 50-61.8% retracement of CD.
Stop loss is placed above X point.
Disclaimer: Please don't trade based only on my analysis, do your own research. I'm not responsible for your losses.