Arachnida contains

Options

A. Wasps
B. Insects
C. Spiders
D. Beetles.

Answer

### Step-by-Step Text Solution:

1. **Understanding the Question**: The question asks what is contained within the class Arachnida.

2. **Identifying the Phylum**: Arachnida is a class within the phylum Arthropoda. Arthropoda is a major phylum that includes a vast number of animals characterized by jointed legs.

3. **Classes of Arthropoda**: The phylum Arthropoda consists of several classes, including Insecta (insects), Arachnida (arachnids), Crustacea (crustaceans), and others.

4. **Defining Arachnida**: The class Arachnida includes various organisms such as spiders, scorpions, mites, and ticks.

5. **Analyzing the Options**:
- **Option 1: Wasps** - Wasps belong to the class Insecta, not Arachnida.
- **Option 2: Insects** - This is a general term for organisms in the class Insecta, which also does not belong to Arachnida.
- **Option 3: Spiders** - Spiders are indeed part of the class Arachnida.
- **Option 4: Beetles** - Beetles also belong to the class Insecta.

6. **Conclusion**: Based on the analysis, the only correct option that belongs to Arachnida is **spiders** (Option 3).

### Final Answer:
**Arachnida contains spiders.**

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