According to Stigler's Search Model,the Marginal Cost of Acquiring Information

According to Stigler's search model,the marginal cost of acquiring information about a product _____

A) is greater for a doctor than for a nurse.
B) is the same for high-income consumers as for low-income consumers.
C) is greater for expensive items than for cheap items.
D) is greater for cheap items than for expensive items.
E) diminishes as more information is acquired.