National symbols of a country represent its identity, culture, and heritage. They are typically chosen to reflect important aspects of the country's history, geography, flora, fauna, or values. In the case of India, the national symbols include the lotus, the Tiranga (Indian flag), and the National Emblem.

1. Lotus:
The lotus is the national flower of India. It is a sacred plant in Hinduism, Buddhism, and Jainism, and holds great cultural and religious significance. The lotus symbolizes purity, beauty, and divine perfection. It is also associated with the ideas of enlightenment and spiritual awakening. The lotus is often depicted in Indian art, architecture, and literature, and is deeply woven into the fabric of Indian culture.

2. Tiranga (Indian Flag):
The Tiranga, also known as the Indian flag, is the national flag of India. It consists of three horizontal stripes of saffron, white, and green, with the Ashoka Chakra (wheel) in navy blue at the center. The saffron color represents courage and sacrifice, the white color symbolizes purity and truth, and the green color signifies fertility, growth, and auspiciousness. The Ashoka Chakra represents the eternal wheel of law and righteousness. The Indian flag is a symbol of national pride, unity, and sovereignty.

3. National Emblem:
The National Emblem of India is an adaptation of the Lion Capital of Ashoka, which is a sculpture originally erected by Emperor Ashoka in the 3rd century BCE. The National Emblem features a depiction of four Asiatic lions standing back to back, mounted on a circular abacus. The abacus bears the inscriptions "Satyameva Jayate" in Devanagari script, which means "Truth alone triumphs." The emblem symbolizes power, courage, and truth. It is used by the Government of India to represent the country and its sovereignty.

Conclusion:
In conclusion, all of the above options (a) Lotus, b) Tiranga, and c) National Emblem) are included as the national symbols of India. The lotus represents purity and beauty, the Tiranga symbolizes national pride and unity, and the National Emblem signifies power and truth. These symbols play a significant role in representing the identity and values of India.