In a Market with 1,000 Identical Firms, the Short-Run Market

In a market with 1,000 identical firms, the short-run market supply is the

A) marginal cost curve above average variable cost for a typical firm in the market.
B) quantity supplied by the typical firm in the market at each price.
C) sum of the prices charged by each of the 1,000 individual firms at each quantity.
D) sum of the quantities supplied by each of the 1,000 individual firms at each price.