Ornithischia contains

Options

A. Aquatic reptiles
B. Reptile hipped dinosaurs
C. Bird hipped dinosaurs
D. Wingless birds

Answer

### Step-by-Step Solution:

1. **Understanding the Term "Ornithischia":**
- The term "Ornithischia" is derived from two parts: "ornith" meaning bird and "ischia" referring to the hip bone. This indicates that Ornithischia refers to a group of dinosaurs that had hip structures similar to those of birds.

2. **Identifying the Characteristics of Ornithischia:**
- Ornithischia includes a variety of extinct dinosaurs that are characterized by their bird-like hip structure. These dinosaurs are primarily herbivorous and are often referred to as "bird-hipped dinosaurs."

3. **Evaluating the Options Provided:**
- **Option A: Aquatic reptiles** - This option refers to reptiles that live in water, such as sea turtles and marine iguanas. These are not related to Ornithischia, which are terrestrial dinosaurs.
- **Option B: Reptile-hipped dinosaurs** - While all dinosaurs are reptiles, the term "reptile-hipped" is not a specific classification and does not accurately describe Ornithischia.
- **Option C: Bird-hipped dinosaurs** - This is the correct option, as it directly describes the group of dinosaurs that Ornithischia refers to.
- **Option D: Wingless birds** - This option refers to birds that cannot fly, such as kiwis and penguins. These are not dinosaurs and do not fit the classification of Ornithischia.

4. **Conclusion:**
- Based on the definitions and evaluations, the correct answer is that Ornithischia contains "bird-hipped dinosaurs."

### Final Answer:
Ornithischia contains **bird-hipped dinosaurs**.

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