Which of the following is a strong synthetic polymer commonly used to make toys and bottles?

• A. Cellulose
• B. Polysaccharide
• C. Polyethylene terephthalate ($\mathrm{PET}$)
• D. Polyisoprene

Answer: (C)

Verified step by step guidance

1. Step 1: Understand the nature of the options given. Cellulose and polysaccharides are natural polymers, while polyisoprene is a natural or synthetic rubber polymer, and polyethylene terephthalate (PET) is a synthetic polymer.
2. Step 2: Recognize that synthetic polymers are man-made through polymerization processes, often used for manufacturing durable goods like toys and bottles.
3. Step 3: Identify that polyethylene terephthalate (PET) is a strong, lightweight, and transparent synthetic polymer widely used in packaging, especially for bottles and containers.
4. Step 4: Recall that cellulose and polysaccharides are biopolymers found in plants and are not typically used for making toys or bottles due to their physical properties.
5. Step 5: Conclude that among the options, polyethylene terephthalate (PET) is the strong synthetic polymer commonly used to make toys and bottles.