The phrase 'That typhoon of demand has now passed' metaphorically suggests that a period of extremely high demand has ended. The key to understanding this phrase lies in the metaphor of a typhoon, which implies a powerful and overwhelming force that eventually dissipates. Option A correctly interprets this metaphor by indicating that the demand has decreased significantly after reaching a peak, which aligns with the imagery of a typhoon passing. Option B is incorrect because it suggests the demand has completely disappeared, which is too absolute and not implied by the metaphor. Option C is incorrect because there is no indication in the phrase that the demand has shifted to a different market. Option D is incorrect because the phrase does not suggest that the demand has become unpredictable and erratic, but rather that it has decreased from a previous high.