Select the option that can be used as a one-word substitute for the given group of words.
A secret agreement especially in order to do something dishonest or deceive people

Correct option is D

The correct one-word substitute for "a secret agreement especially in order to do something dishonest or deceive people" is (d) collusion.
• Collusion: refers to a secret or illegal cooperation or conspiracy, especially in order to deceive or cheat others.
• Collusion: मिलीभगत (Hindi meaning).
• Example: The companies were found guilty of collusion to fix prices at an artificially high level.
Meanings of the given other options:
• (a) Collision: An instance of one moving object or person striking violently against another.
• (b) Collocation: The habitual juxtaposition of a particular word with another word or words with a frequency greater than chance.
• (c) Colloquy: A formal conversation or dialogue.