KBC 2023| Which of these is the biggest size of paper? KBC 2023, Check the answer to the question- Which of these is the biggest size of paper? By Himani Budakoti - September 8, 2023 KBC 2023, Amitabh Bachchan. (Representative Image) KBC 2023, The options of the question – Which of these is the biggest size of paper? A. A1 B. A2 C. A3 D. A4 The answer is A. A1.