The question asks to identify the author of the autobiography titled 'Waiting for a visa'. This title refers to a specific autobiographical sketch.
The autobiography 'Waiting for a visa' was written by Dr. B.R. Ambedkar. This work offers insights into his personal experiences, particularly highlighting the challenges and discrimination he faced due to his caste.
While Jawaharlal Nehru, Indira Gandhi, and Satyajit Ray are prominent Indian figures, they are not the authors of this particular autobiography. Dr. B.R. Ambedkar's 'Waiting for a visa' is a well-known piece among his writings.
Therefore, the correct author is B.R. Ambedkar.
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