Entomology is the study of

Options

A. Enteron
B. enteric epithelium
C. Insects
D. Arachnids.

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the definition of "entomology." We need to identify what field of study it pertains to from the given options.

2. **Analyzing the Options**:
- **Option A: Entron**: This term refers to the alimentary canal or digestive system. The study related to this is known as gastroenterology, which is not relevant to entomology.
- **Option B: Enteric Epithelium**: This refers to the tissue lining the intestines. Like the first option, this is also related to gastroenterology and not entomology.
- **Option C: Insects**: This option states that entomology is the study of insects. This is the correct definition, as entomology encompasses the study of various aspects of insects, including their morphology, physiology, behavior, and ecology.
- **Option D: Arachnids**: Arachnids include spiders and scorpions. The study of arachnids is known as arachnology, which is distinct from entomology.

3. **Conclusion**: After evaluating all the options, it is clear that entomology is the study of insects. Therefore, the correct answer is **Option C: Insects**.