Consider the market for baseball caps. There are many producers in this market, and we assume that the technology of production is identical among these producers. A typical producer in this market has a U-shaped average variable cost curve with the minimum average variable cost at $2.50, and a U-shaped average total cost curve with the minimum average total cost at $3.50. What does the market supply of baseball caps look like in the long run? Choose one: A. an upward-sloping curve that starts at the price of $3.50, with zero supply at a price less than $3.50 B. a horizontal line at a price of $3.50 C. an upward-sloping curve that starts at the price of zero D. an upward-sloping curve that starts at the price of $2.50, with zero supply at a price less than $2.50