A, B, C
First, (A) can go because the vehicle that uses its distinctive signals at the same time always has priority, this is clear to everyone in relation to other drivers!
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Then the car marked (B) can go second, and the vehicle marked (C) will follow, since it is an equal road at an intersection without a sign. In this case, the right-hand rule comes into effect. (You give way from the right, you get the right of way from the left)