Discussion
Extrapolating the output characteristics backwards, the intercept on the voltage axis is
Answer: A
Extrapolating the output characteristics backwards, they converge on the negative voltage axis, and that intercept is the Early voltage - a large value meaning flat characteristics and high output resistance. Saturation voltage, breakdown voltage and the base drop are all separate parameters. A figure defined by an extrapolated intercept is a convenient way to summarise a slope, and it appears the same way in several device models. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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