Discussion
What is the tail current shared between when no signal is applied?
Answer: C
With equal inputs and matched devices each carries half the tail current, so the two collector voltages are equal and the differential output is zero. Complete steering to one side is what a large differential input produces, and neither the loads nor the supplies divide it at rest. That the resting condition is a clean half-and-half split is what makes the stage's balance point so well defined.
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