Euphenics is

Options

A. Improvement of human race by better environment
B. Improvement of human race by genetic engineering
C. Treatment of communicable diseases
D. Treatment of inheritable diseases.

Answer

### Step-by-Step Solution:

1. **Understanding Euphenics**: Euphenics is a term that refers to the treatment of inheritable diseases in humans. It focuses on improving the phenotype of individuals after birth.

2. **Phenotypic Improvements**: Euphenics deals with the changes in physical conditions to mitigate the effects of genetic diseases. This means that it aims to improve the observable traits or characteristics of a person who may be affected by genetic disorders.

3. **Evaluating the Options**:
- **Option A**: Improvement of human race by better environment. This is incorrect as euphenics specifically addresses inheritable diseases rather than environmental factors.
- **Option B**: Improvement of human race by genetic engineering. This is also incorrect because euphenics does not involve genetic modification but rather focuses on treatment after birth.
- **Option C**: Treatment of communicable diseases. This option is incorrect as euphenics is not concerned with diseases that can be transmitted from one person to another.
- **Option D**: Treatment of inheritable diseases. This is the correct answer as it aligns with the definition of euphenics.

4. **Conclusion**: The correct answer to the question "Euphenics is" is **D: treatment of inheritable diseases**.