And they’ve only got about four roads…
An amazing country to drive in and the best beer in Southern Africa - not that I’m…
I think It is C but not everyone knows that, especially at a T junction.
@Chrisell has done the sbsolute best answer. Especially the bit about Parisians 
For what it’s worth, my wife, who learned to drive in Belgium where they love priorité à droite, thinks the answer there would be C,B,A. C goes first due to there being no car coming directly from it’s right, that then in turn frees up B which also now has no car to its right, and finally A is free to go. That said, in Belgium if you stop, you lose your priority..
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I think it’s priority to the pedestrian who is standing just behind the bush on the left. 
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If I was A, I would just sit tight and let the other two sort it out. Same if I were C. I have been in too many bingles in situations like this.
If I am A, B or C, I’ll just take the bus.
I presume this is in an urban area. ie within the commune signs. So A must give way to B and B must give way to C and in turn C must give way to A. So in fact in my opinion no-one has priority and an accident is likely. Maybe some road markings and Give Way signs would be good. But hell, this is France.