This one is a possible that completes if the triangle gets broken to the downside. B is a bit above the normal 61.8% of XA but still rather close imo .
A breakout will often be followed by some consolidation or a re-test of the so this is also in line with that scenario.
Because of the breakout the upside could be limited so I would suggest taking at least 80%, if not the full 100, at TP1. But that all depends on your rules of course!
Please also check my idea on pattern targets which could convince you to take 100% at TP1 on most or all your trades...: