According to Regression Hypothesis, viruses might have originated from

Options

A. Algae
B. Bacteria
C. Blue green algae
D. Plasmids

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the origin of viruses according to the Regression Hypothesis.

2. **Identifying the Hypotheses**: There are three main hypotheses regarding the origin of viruses:
- Regression Hypothesis
- Protovirus (or Progressive) Hypothesis
- Epitome Hypothesis

3. **Focusing on the Regression Hypothesis**: The Regression Hypothesis specifically suggests that viruses have developed from bacteria. This implies that at some point in evolutionary history, certain bacteria lost their cellular structures and functions, leading to the formation of viruses.

4. **Conclusion**: According to the Regression Hypothesis, viruses might have originated from bacteria.