Earthworms differ from most of the marine annelids in that earthworms:

Options

A. lack setae that marine annelids have
B. lack paddle-like parapodia that marine annelids have
C. have segments, whereas marine annelids do not
D. have well-developed brains and sensory organs in the head region, whereas marine annelids do not

Explanation

To answer the question about how earthworms differ from most marine annelids, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Key Characteristics of Earthworms**:
- Earthworms are terrestrial annelids that have specific features that distinguish them from marine annelids.

2. **List Features of Earthworms**:
- Earthworms possess **setae** (four pairs) that aid in movement.
- They have a **simple nervous system** with five hearts and a small brain.
- Their body is segmented, which is a common trait in annelids.
- **Lack of Parapodia**: Earthworms do not have parapodia, which are fleshy protrusions found in many marine annelids that assist in locomotion.

3. **Compare with Marine Annelids**:
- Marine annelids, such as polychaetes, typically have parapodia that help them swim or crawl in aquatic environments.
- Earthworms, being terrestrial, do not require such adaptations for movement.

4. **Evaluate the Options**:
- Option A: "Lacks setae" - Incorrect, as earthworms have setae.
- Option B: "Lacks pedal-like parapodia" - Correct, as earthworms do not have parapodia.
- Other options can be analyzed similarly but are not necessary for this question.

5. **Conclusion**:
- The correct answer is that earthworms differ from most marine annelids in that they **lack pedal-like parapodia**.

### Final Answer:
Earthworms differ from most marine annelids in that they **lack pedal-like parapodia**.

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