The correct answer is: C. Ashwin Purnima.
Ashwin Purnima is the full moon day of the Hindu month of Ashwin. It is also known as Guru Nanak Jayanti, the birth anniversary of Guru Nanak Dev Ji, the first Guru of Sikhism. Guru Nanak Dev Ji was born on this day in 1469 in Rai Bhoi di Talwandi, now known as Nankana Sahib in Pakistan. He is considered the founder of Sikhism and is revered by Sikhs as the supreme Guru.
Ashwin Purnima is a major religious festival for Sikhs. It is a time of celebration and thanksgiving. Sikhs gather at gurdwaras (Sikh temples) to offer prayers and listen to hymns. They also distribute food and gifts to the poor.
Ashwin Purnima is also a time for pilgrimage. Sikhs visit the Gurdwara Janam Asthan in Nankana Sahib, Pakistan, the birthplace of Guru Nanak Dev Ji. They also visit other gurdwaras associated with the life of Guru Nanak Dev Ji.
Ashwin Purnima is a time of joy and peace for Sikhs. It is a time to reflect on the teachings of Guru Nanak Dev Ji and to renew their commitment to Sikhism.