Explanation:

- The National Film Awards are prestigious awards presented annually by the Directorate of Film Festivals in India.

- Option 1: Basundhara - Released in 2010, directed by Hiren Boro, it didn't win the award for 2014.

- Option 2: Othello - A 2014 Assamese film directed by Hemanta Kumar Das, but it didn’t bag the National Award for that year.

- Option 3: Bandhon - Directed by Jahnu Barua, this film actually won the National Film Award for Best Assamese Film in 2012.

- Option 4: Ajeyo - This film, directed by Jahnu Barua in 2014, won the National Film Award for Best Assamese Film for that year.