.................. transcribes rRNAs (28s, 18s, and 5.8s).

Options

A. RNA polymerase I,
B. RNA polymerase II,
C. RNA polymerase III
D. RNA polymerase IV

Explanation

To solve the question regarding which RNA polymerase transcribes rRNAs (28S, 18S, and 5.8S), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of RNA Polymerases**:
- There are three main types of RNA polymerases in eukaryotic cells:
- RNA Polymerase I
- RNA Polymerase II
- RNA Polymerase III

2. **Identify the Function of Each RNA Polymerase**:
- **RNA Polymerase I**: Primarily responsible for transcribing ribosomal RNA (rRNA), which includes 28S, 18S, and 5.8S rRNAs.
- **RNA Polymerase II**: Transcribes messenger RNA (mRNA) and some small nuclear RNAs (snRNA) and microRNAs (miRNA).
- **RNA Polymerase III**: Transcribes transfer RNA (tRNA) and 5S rRNA.

3. **Focus on the Question**: The question specifically asks which RNA polymerase transcribes rRNAs (28S, 18S, and 5.8S).

4. **Select the Correct Answer**: Since RNA Polymerase I is responsible for transcribing the rRNAs mentioned in the question, the correct answer is:
- **RNA Polymerase I** transcribes rRNAs (28S, 18S, and 5.8S).

### Final Answer:
**RNA Polymerase I transcribes rRNAs (28S, 18S, and 5.8S).**

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