Recently, P : containing memorable letters of Churchill Q : a book R : has been published S : by a reputed publisher The Proper sequence should be:

Option B: QPRS

This option puts the publisher before the book. This is incorrect because the book was published before the publisher.

Option C: QRPS

This option puts the book before the letters. This is incorrect because the letters are contained in the book.

Option D: RQPS

This option puts the publisher before the letters. This is incorrect because the letters were written before the publisher.