Which of these books are written by Nirad C Chaudhuri?
[A] The continent of Circe
[B] Principal Upanishads
[C] A passage to England
[D] Our new rulers
[E] The autobiography of an unknown Indian
Choose the correct answer from the options given below:

The correct answer is A, C and E only.

Let us analyze the authorship of each of the books mentioned in the question to understand why this option is correct:

[A] The Continent of Circe: This book was written by Nirad C. Chaudhuri and published in 1965. It is a famous work of non-fiction focusing on Indian society and culture.
[B] Principal Upanishads: This is a prominent work by Dr. Sarvepalli Radhakrishnan, the second President of India, not Nirad C. Chaudhuri.
[C] A Passage to England: This book was written by Nirad C. Chaudhuri and published in 1959. It recounts his first visit to England and compares English society with Indian society.
[D] Our New Rulers: This is not written by Nirad C. Chaudhuri.
[E] The Autobiography of an Unknown Indian: This is the most famous work of Nirad C. Chaudhuri, published in 1951, which established his reputation as a writer.

Therefore, the books written by Nirad C. Chaudhuri are A, C, and E.