Correct Answer: Crusade

Solution : The correct choice is the fourth option.

Explanation:

The term that can substitute a given group of words for "a religious war" is crusade . The term crusade has come to represent any vigorous, organised campaign or movement for a cause, especially one with a strong moral or religious aspect.

The meanings of the other options are as follows:

• Inscription refers to words that are written, engraved, or carved on a surface, typically a monument, stone, or other durable material.
• Colonialism refers to a system in which a country extends its control over other territories, often for economic exploitation.
• Colloquial refers to language or expressions used in ordinary or informal conversation rather than formal speech or writing.