After compromising on the cabling, or finding lower cost cabling that outperformed higher cost cabling in the particular system, I would save money on amplification by choosing speakers that provide higher efficiency and/or impedance characteristics that are easier to drive. Even if that means a slight compromise in speaker performance relative to other speaker candidates that are harder to drive.
Not sure whether to consider that as alternative B or alternative D. The $ are saved on the amplifier, but the possible sonic compromise (or at least a narrowing of the range of suitable choices) is in the speakers. Apologies if that violates your stipulation of an "absolute answer."
Best regards,
-- Al