The correct answer is: C. Dhanak
Dhanak is a 2015 Indian Hindi-language road film directed by Nagesh Kukunoor. The film stars Hetal Gada and Geetanjali Thapa. It tells the story of two children, Pari and Ishaan, who set out on a journey to Rajasthan to find a magical pair of sunglasses that will help Pari see.
The film was awarded the Crystal Bear for Best Children’s Film at the 66th Berlin International Film Festival. It was also India’s official entry for the Best Foreign Language Film at the 88th Academy Awards.
Ottal is a 2015 Indian Malayalam-language drama film directed by Jayaraj. The film stars Fahadh Faasil, Indrajith Sukumaran, and Lakshmi Gopalaswami. It tells the story of a man who returns to his village after many years to find that it has been destroyed by a dam.
Killa is a 2015 Indian Marathi-language drama film directed by Avinash Arun. The film stars Suraj Venjaramoodu, Anjali Patil, and Neeraj Kabi. It tells the story of a young boy who is sent to live with his grandmother in a small village after his parents are killed in a car accident.
Hail is a 2015 Indian Tamil-language drama film directed by Mari Selvaraj. The film stars Dhanush, Manjima Mohan, and Samuthirakani. It tells the story of a man who is forced to leave his village after he is accused of murder.
All four films are critically acclaimed and have won numerous awards. However, Dhanak is the only film that was awarded the Crystal Bear for Best Children’s Film at the 66th Berlin International Film Festival.