Holi is a traditional Hindu festival celebrated in India and other parts of the world. It is known as the "Festival of Colors" and marks the arrival of spring. Holi is typically celebrated in the month of March, which is known as the transition period between winter and summer. Therefore, the correct answer is option 'C' - Spring.

Explanation:

1. Holi - The Festival of Colors:
- Holi is one of the most vibrant and joyous festivals in India.
- It is celebrated with great enthusiasm and fervor by people of all ages.
- The festival is known for its colorful celebrations, where people throw and smear each other with colored powders and water.
- It is a time of joy, unity, and the triumph of good over evil.

2. Arrival of Spring:
- Holi is celebrated during the transition from winter to summer, which is the arrival of the spring season.
- Spring is a season of new beginnings, growth, and rejuvenation.
- The weather during spring is usually pleasant, with moderate temperatures and blooming flowers.
- The festival of Holi is a way to welcome the arrival of spring and bid farewell to the cold winter season.

3. Significance of Spring:
- Spring is considered a season of hope and renewal.
- It symbolizes the end of the dormant winter period and the beginning of new life and growth.
- The blooming of flowers, the chirping of birds, and the longer daylight hours are all signs of the arrival of spring.
- It is a time when nature comes alive with vibrant colors and beauty.

4. Holi Celebrations:
- During Holi, people come together to play with colors, dance, sing, and enjoy festive delicacies.
- It is a time of unity and togetherness, where people forget their differences and celebrate the spirit of joy and love.
- Holi also holds religious significance, as it is associated with various mythological stories and legends.

In conclusion, Holi is celebrated to welcome the arrival of spring. It is a festival that brings people together to celebrate the beauty and vibrancy of nature during the transition from winter to summer.