Which of the following is the repeating unit in polyvinyl chloride (PVC) ? 
Definitions:
Perpetuity
A financial term describing an infinite series of periodic payments or cash flows that continue indefinitely, often used to calculate the present value of such payments.
Consumer Decision Making Process
The consumer decision making process is a series of steps that shoppers follow to make choices about which products or services to buy.
Social Media Users
Individuals who use platforms on the internet to create, share, or exchange information, ideas, pictures/videos in virtual communities and networks.
Social Commerce
The practice of buying and selling products or services directly through social media platforms, leveraging the social network for commerce.
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