The foundation of modern classification was laid in a book of Linnaeus entitled

Options

A. Genera Plantarum
B. Species Plantarum
C. Systema Naturae
D. Philosophica Botanica

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the title of the book by Carl Linnaeus that laid the foundation of modern classification.

2. **Identifying Carl Linnaeus**: Recognize that Carl Linnaeus was a prominent botanist known for his contributions to taxonomy and classification of living organisms.

3. **Reviewing the Options**: The options provided are:
- A) Genera Plantarum
- B) Species Plantarum
- C) Systema Naturae
- D) Philosophica Botanica

4. **Analyzing Each Option**:
- **Genera Plantarum**: This book discusses a sexual system of classification based on the number of stamens and pistils.
- **Species Plantarum**: This book introduces the binomial nomenclature system for naming species.
- **Systema Naturae**: This is the book where Linnaeus established the foundation of modern classification.
- **Philosophica Botanica**: This book is known for the first published description of binomial nomenclature.

5. **Determining the Correct Answer**: Among the options, "Systema Naturae" is recognized as the foundational work for modern biological classification.

6. **Conclusion**: The correct answer to the question is **C) Systema Naturae**.