A) Ravinder Singh
B) Chetan Bhagat
C) Amish Tripathi
D) Durjoy Datta
Explanation: Chetan Bhagat will release his new novel titled ‘400 Days’ on October 08, 2021. He has released the cover for the same. It is the third novel in the Keshav-Saurabh series, after ‘The Girl in Room 105’ and ‘One Arranged Murder’.