Step 1: Understanding the Question
The question asks to identify the first person who held the position of National Librarian at the National Library of India. This requires knowledge of the history of the library and its key figures.
Step 2: Key Formula or Approach
The approach involves recalling historical facts about the National Library of India, specifically its establishment post-independence and the appointment of its first librarian.
Step 3: Detailed Explanation
The National Library of India was established in its modern form after India's independence. It was formed by renaming the former Imperial Library.
In 1948, the government appointed B. S. Kesavan as the first National Librarian of the independent National Library of India.
He was a pivotal figure in shaping the library into a national institution, responsible for collection development, bibliographic services, and preserving the country's literary heritage.
Step 4: Final Answer
Based on historical records, B. S. Kesavan was the first National Librarian of India, appointed in 1948. Therefore, Option (A) is the correct answer.