Introduction:
Langar is a term used in Sikhism to refer to the communal kitchen where free food is served to all people, regardless of their caste, religion, or social status. It is an integral part of Sikh practices and is organized on various occasions and festivals. Among the options provided, the correct answer is option 'B' - Gurpurab.

Gurpurab:
Gurpurab is a term used to refer to the birth anniversary or the martyrdom anniversary of the Sikh Gurus. Sikhs celebrate these occasions with great reverence and joy. The main purpose of celebrating Gurpurab is to remember and honor the teachings and contributions of the Sikh Gurus.

Langar during Gurpurab:
During Gurpurab, langar holds significant importance for Sikhs. It is organized in gurdwaras (Sikh temples) and other public places to provide free meals to everyone, including the Sikh community and visitors from other religions. Langar during Gurpurab is a way to practice the principle of seva (selfless service) and promote equality among all individuals.

Significance of langar during Gurpurab:
1. Equality: Langar symbolizes the core Sikh principle of equality. By serving and eating together, people from different backgrounds and social statuses are reminded of their shared humanity and the importance of treating everyone with respect and dignity.

2. Community bonding: Langar during Gurpurab brings people together, fostering a sense of community and unity. It provides an opportunity for individuals to connect, share their experiences, and build relationships.

3. Seva: Serving in langar is considered an act of seva, which is highly valued in Sikhism. It promotes the spirit of selflessness, compassion, and humility.

4. Abundance and sharing: Langar signifies the abundance of resources and the willingness to share with others. It breaks down barriers of scarcity and encourages individuals to help those in need.

5. Breaking bread: The act of sharing a meal in langar holds deep symbolism in various cultures and religions. It represents hospitality, friendship, and a sense of belonging.

Conclusion:
Langar is organized during Gurpurab, which is a significant festival for Sikhs. It allows people to come together, practice equality, and serve others selflessly. Langar holds immense importance in Sikhism, promoting the values of community, seva, and compassion.