Finding Moment

Hi can anybody tell me if my working for finding the moment of a b c is correct?

Taking clockwise as +ve

Ma+1.2k x 3 +0.7 x 7 = 0
Ma= -8.5Knm

Mb-8.5+1.9k x 3=0

Mc=1.2k x 4 +1.9k x 7 -8.5k=0

Hence Point B has the biggest moment am I right? However the book says is Point A. Please advice, thank you.

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