The clock was properly stopped as an officials time out because of the action at the end of the play; specifically, the tackling of B who possessed the ball (a change in team possession).
It is therefore, by rule 3-4-2 (b)3, this same action that does not allow the clock to start until the snap, regardless of whether a penalty was involved.
The logic that says the clock should start on the ready would require you to conclude that the clock should not have been stopped in the first place. But the clock has to stop when the ball became dead, and therefore, it has to only start on the snap.
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