Agaricus, alternaria and Aspergillus are genera of fungi which are included in three different classes. The respective order of these classes will be:

Options

A. Phycomycetes, Ascomycetes and Basidiomycetes
B. Basidiomycetes, Deuteromycetes and Ascomycetes
C. Ascomycetes, Basidiomycetes and Deuteromycetes
D. Basidiomycetes, Phycomcyetes and Ascomycetes.

Answer

To solve the question regarding the classification of the fungi genera Agaricus, Alternaria, and Aspergillus, we will follow these steps:

### Step 1: Identify the Genera and Their Classes
1. **Agaricus**: This genus is commonly known as mushrooms and belongs to the class **Basidiomycetes**.
2. **Alternaria**: This genus is known for its role as a plant pathogen and belongs to the class **Deuteromycetes** (also known as Imperfect Fungi).
3. **Aspergillus**: This genus is a type of mold and belongs to the class **Ascomycetes**.

### Step 2: List the Classes in Order
Now that we have identified the classes for each genus, we can list them in the order they were presented in the question:
- **Agaricus**: Basidiomycetes
- **Alternaria**: Deuteromycetes
- **Aspergillus**: Ascomycetes

### Step 3: Compile the Final Answer
The respective order of the classes for the genera Agaricus, Alternaria, and Aspergillus is:
- **Basidiomycetes**, **Deuteromycetes**, **Ascomycetes**.

### Conclusion
Therefore, the correct answer is the sequence: **Basidiomycetes, Deuteromycetes, Ascomycetes**.

---