Baby feeding bottles are made up of

Options

A. polyamide
B. polystyrene
C. polyester
D. polyurea

Explanation

To determine what material baby feeding bottles are made of, let's analyze the options provided:

1. **Polyamide**: This polymer is linked through amide bonds and is commonly used in textiles. It is not typically used for baby feeding bottles.

2. **Polystyrene**: This is a type of polymer that is indeed used to make baby feeding bottles. It is known for its clarity, rigidity, and ease of molding, making it a suitable choice for such applications.

3. **Polyester**: This polymer contains ester linkages in its primary chain and is primarily used in making carpets and ropes, not baby feeding bottles.

4. **Polyurea**: This is a type of polymer that is used for maintenance coatings and is not suitable for making baby feeding bottles.

Based on the analysis of the options, the correct answer is:

**Answer: B) Polystyrene**

### Step-by-Step Solution:

1. **Identify the materials**: Look at the options given (polyamide, polystyrene, polyester, polyurea) and understand what each polymer is made of and its common uses.

2. **Analyze each option**:
- **Polyamide**: Used in textiles, not suitable for feeding bottles.
- **Polystyrene**: Known for its use in baby feeding bottles due to its properties.
- **Polyester**: Used for carpets and ropes, not feeding bottles.
- **Polyurea**: Used for coatings, not feeding bottles.

3. **Select the correct option**: After analyzing the uses of each polymer, identify that polystyrene is the one used for baby feeding bottles.