如果大量制造某种商品导致其成本下降，那么这就有可能增加卖方和制造商的供给，这样反过来又降低了价格，让更多的消费者购买产品。

A.If producing more of a commodity results in reducing its cost, this will tend to increase the supply offered by seller-producers, which in turn will lower the price and permit more consumers to buy the product.

B.If producing more of a commodity results in reducing its cost, this will tend to increase the supply offered by seller-producers, that in turn will lower the price and permit more consumers to buy the product.

C.If producing more of a commodity results in reducing its cost, which will tend to increase the supply offered by seller-producers, it in turn will lower the price and permit more consumers to buy the product.

D.If producing more of a commodity results in reducing its cost, this will tend to increase the supply offered by seller-producers, while in turn will lower the price and permit more consumers to buy the product.

正确答案：If producing more of a commodity results in reducing its cost, this will tend to increase the supply offered by seller-producers, which in turn will lower the price and permit more consumers to buy the product.