The most likely reason why laundry businesses were so successful was that D. Laundries used automatic washers and dryers to lower the price.
Seeing as there is no attached article, this will have to be approached based on economic logic.
Businesses are generally more successful when they offer lower prices to their customers.
The most likely reason that laundry businesses would be successful therefore is that they offer lower prices on laundry services due to them using automatic washers and dryers.
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