Discussion
What is the leakage current between collector and base with the emitter open?
Answer: C
With the emitter out of circuit the collector-base junction is simply a reverse-biased diode, so its leakage is a reverse saturation current, roughly doubling every ten degrees. It is not set by the base-emitter drop, is unrelated to beta, and grows slightly rather than falling with voltage. This leakage is amplified by beta in the common-emitter configuration, which is why thermal stability is such a preoccupation in transistor biasing. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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