Who was the first nun of Gautama Buddha?

Answer: Option C

Mahapajapati Gotami (Pali; Sanskrit Mahaprajapati Gautamī) was the step-mother and maternal aunt (mother's sister) of the Buddha. In Buddhist tradition, she was the first woman to seek ordination for women, which she did from Gautama Buddha directly, and she became the first bhikkhuni (Buddhist nun).