Final answer:
The synthetic fabric made by flowing extruded polyvinyl chloride onto a base cloth is known as vinyl.
Step-by-step explanation:
The name of the synthetic fabric consisting of extruded polyvinyl chloride 'flowed' onto a woven, knitted, or non-woven base cloth is vinyl. Polyvinyl chloride, or PVC, is a versatile polymer that can be made rigid for use in construction, or, when plasticized, it becomes soft and flexible for applications such as upholstery and clothing. The other options listed, such as neoprene, pleather, and spandex, are all distinct synthetic materials used for different applications. For instance, neoprene is another type of synthetic rubber with a wide range of uses, from wetsuits to gaskets, but it is not the same as the fabric described in the question.