Human beings live on earth. It provides them with all the necessities of life other than some such as sunlight. Human beings live only on earth. We call the place where we live as our "HOME." So since we human beings live on earth, we call it our home. Also, we do not go elsewhere in this universe. We do not go to any other planet such as Mars or elsewhere to live. As of now, we haven't even visited them.

Home of Humankind

There is no doubt that the correct answer to the question "Which is the home of humankind?" is option 'C' - Earth. Let's explore the reasons why Earth is considered the home of humankind in detail.

1. Unique Conditions for Life
Earth is the only known planet in our solar system that possesses the necessary conditions for life to thrive. It is located at an ideal distance from the Sun, which allows it to have a relatively stable climate and temperature range suitable for life. Additionally, Earth has a protective atmosphere that shields it from harmful solar radiation and provides the necessary gases for sustaining life.

2. Abundance of Water
Water is essential for the existence of life as we know it, and Earth is the only planet where water exists in liquid form on its surface. The presence of liquid water enables the development and sustenance of diverse ecosystems, providing habitats for various organisms.

3. Rich Biodiversity
Earth is teeming with an incredible diversity of life forms, ranging from microscopic organisms to complex multicellular organisms. The planet's diverse ecosystems, including forests, oceans, grasslands, and deserts, support a wide array of plant and animal species. This biodiversity is a testament to Earth's unique ability to foster and sustain life.

4. Human Evolution
The history of human evolution can be traced back to Earth. Fossil and archaeological evidence indicate that our species, Homo sapiens, originated in Africa and gradually spread across the globe. The Earth's ecosystems and resources played a crucial role in the development and survival of early humans.

5. Suitable Atmosphere
Earth's atmosphere consists of a mix of gases, primarily nitrogen, oxygen, carbon dioxide, and trace amounts of other gases. This composition is crucial for supporting life, as it provides the necessary oxygen for respiration and regulates the planet's temperature through the greenhouse effect.

Conclusion
In conclusion, Earth is undeniably the home of humankind. Its unique combination of conditions, including suitable distance from the Sun, abundance of water, rich biodiversity, human evolutionary history, and a supportive atmosphere, make it the only known planet capable of sustaining life as we know it.

Option 'C' is the correct answer.