The central body cavity of coelenterates is called

Options

A. Gastro-vascular cavity
B. Spogocoel
C. Coelom
D. Hypostome

Explanation

### Step-by-Step Solution:

1. **Understanding Coelenterates**: Coelenterates belong to the phylum Cnidaria, which includes organisms such as jellyfish, corals, and sea anemones. They are characterized by having a central body cavity.

2. **Identifying the Central Body Cavity**: The central body cavity in coelenterates is not a true coelom like that found in higher animals. Instead, it is a simple cavity that serves multiple functions.

3. **Naming the Central Body Cavity**: This central cavity is called the "gastrovascular cavity." It plays a crucial role in digestion and circulation within the organism.

4. **Alternative Name**: The gastrovascular cavity is also referred to as the "coelenteron." This term emphasizes its function in both digestion and the distribution of nutrients.

5. **Excluding Other Options**: Other terms mentioned, such as "spongocoel" (related to sponges), "coelom" (true body cavity in annelids), and "hypostome" (part of the mouth structure), are not applicable to coelenterates.

6. **Conclusion**: Therefore, the correct answer to the question is that the central body cavity of coelenterates is called the "gastrovascular cavity" or "coelenteron."