The repeating unit of poly(methyl methacrylate) is shown below.Which one of the following is the monomer used to make poly(methyl methacrylate) ? 
Definitions:
Product Cost
The total expense incurred in bringing a product to market, including raw materials, labor, and overhead.
Quality Costs
The total amount of costs associated with ensuring the quality of a product or service, including prevention, appraisal, and failure costs.
Upper Control Limit
In process control, the maximum value on a chart indicating the threshold of acceptable variation in a process.
Operator Action
The specific actions or interventions performed by a person or control system operating machinery or equipment, often in response to indicators or to manage a process.
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