Discussion
What is a common rule of thumb for the emitter resistor's voltage drop?
Answer: D
Allotting roughly a tenth of the supply to the emitter gives useful stabilisation - a volt or so, against a 0.7 V junction drop whose two-millivolt-per-degree change is then a small fraction - while leaving most of the supply for the swing. Half would waste far too much headroom, one junction drop is marginal, and matching the collector resistor's drop would halve the available output. A rule of thumb encodes a compromise someone has already worked through, and knowing which compromise makes it safe to depart from.
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