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Horizontal sum of the quantities in market supply curves

The short-run supply curve for a purely competitive industry is the horizontal total of the: (a) quantities demanded by consumers at each price. (b) prices charged by individual firms for each quantity supplied. (c) quantities supplied by established firms at each possible price. (d) quantities supplied by new firms entering the industry at every price.

Can anybody suggest me the proper explanation for given problem regarding Economics generally?

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