This question is asking about which literary work has been most recently adapted into a full-length feature film.

Option 1, R. K. Narayan`s Malgudi Days, is a collection of short stories that was turned into a television series but not a full-length feature film.

Option 2, Salman Rushdie’s Midnight’s Children, was made into a film, but this adaptation predates the ones in option 3 and 4.

Option 3, Vikram Seth’s A Suitable Boy, was recently adapted into a mini-series for television, not a full-length feature film.

Option 4, Upamanyu Chatterjee’s English August, is the correct answer as it was the most recent work, among the options, to be adapted into a feature film. The film adaptation was released in 1994.

So, while all of these works have been adapted in some form for screen, only English August answers the exact question of being made into a full-length feature film most recently.