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Solutions
The correct answer is option 3 i.e. Fundamental.
Given word: Keystone
Meaning: The central principle or part of a policy, system, etc., on which all else depends.
Example: Education is the keystone of success.
Synonym: Fundamental
Meaning: Forming a necessary base or core; of central importance.
Example: Respect for law is fundamental to a civilized society.
Meaning of the other words:
Forbid: Refuse to allow something.
Boycott: Withdraw from commercial or social relations as a protest.
Negate: To nullify or make ineffective.
Hence, the chosen option will be correct.