CRUSADE is the one word substitute for :

The correct answer is Option (4) → Religious war

A crusade is a war fought for a religious cause. The word comes from the wars that European Christians fought in the Middle Ages to win Jerusalem. Today it also means a long, strong campaign for a cause, but its first meaning is a religious war.
Example: The first crusade began in 1096.

Why the Other Options are Incorrect?

Option 1: Horror film — Incorrect. A horror film is a film meant to frighten the viewer. Crusade has no link with films.
Example: We watched a horror film and could not sleep afterwards.

Option 2: Primitive construction — Incorrect. This means a simple, early kind of building, such as a hut. It is not what crusade means.
Example: The mud hut was a primitive construction of sticks and clay.

Option 3: Game of chess — Incorrect. Chess is a board game for two players. A crusade is a war, not a game.
Example: Grandfather won the game of chess in twenty moves.