Body is segmented in
(a) Arthropoda
(b) Cnidaria
(c) Annelida
(d) Both (a) and (c)

Options

A. Arthropoda
B. Cnidaria
C. Annelida
D. Both (a) and (c)

Answer

To solve the question regarding which organisms have segmented bodies, we will analyze each option given:

1. **Understanding Segmentation**: Segmentation refers to the division of an organism's body into repetitive segments. This feature is significant in various phyla, particularly in the context of body organization and development.

2. **Analyzing the Options**:
- **(a) Arthropoda**: This phylum includes insects, arachnids, and crustaceans. Arthropods exhibit segmentation, specifically metameric segmentation, where the body is divided into segments that often have repeated structures. Thus, this option is correct.

- **(b) Cnidaria**: This phylum includes jellyfish, corals, and sea anemones. Cnidarians do not exhibit true segmentation. Their body structure is more radial and does not have the segmented organization seen in other phyla. Therefore, this option is incorrect.

- **(c) Annelida**: This phylum includes earthworms and leeches. Annelids are known for their distinct metameric segmentation, where the body is divided into a series of segments, each containing similar organ systems. Thus, this option is also correct.

- **(d) Both (a) and (c)**: Since both Arthropoda and Annelida exhibit segmentation, this option is correct.

3. **Conclusion**: Based on the analysis, the correct answer to the question "Body is segmented in" is **(d) Both (a) and (c)**.

### Step-by-Step Solution:
1. Identify the concept of segmentation in biology.
2. Evaluate the segmentation in Arthropoda.
3. Evaluate the segmentation in Cnidaria.
4. Evaluate the segmentation in Annelida.
5. Determine the correct answer based on the evaluations.