The phrase "not so much a solution as a political expedient" implies a critical assessment of the chairman's proposal, suggesting it lacked genuine problem-solving intent. An "expedient" refers to something convenient and practical, though possibly improper or immoral, used to achieve a particular end quickly.
Option B is correct because it accurately captures this nuance. The statement means the proposal was designed primarily to serve short-term political interests or to avoid immediate political fallout, rather than addressing the core issue effectively or sustainably. It prioritizes political gain over a true, lasting resolution.
Option A is incorrect as the phrase explicitly states it was "not so much a solution," directly contradicting the idea of it being a perfect solution. Option C is incorrect because the statement describes the nature of the proposal, not its reception; it doesn't provide information about whether it was rejected or accepted. Option D is incorrect as the statement focuses on the proposal's intent and effectiveness, not its legality or cost.