In the following sentence, identify the word pair used:
The change in the rules makes the previous agreement null and void.

Correct option is C

The correct option is (c).
• Explanation: The sentence utilizes a common idiomatic legal word pair or binomial expression: null and void. A word pair consists of two words linked by a conjunction (usually 'and') that function together as a single phrase with a specific idiomatic meaning.
• Correct answer word – null and void
Hindi meaning: अमान्य / शून्य और निष्प्रभावी
Example:
The contract was declared null and void by the supreme court judge due to a lack of signatures.
Meanings of other options:
• The change – A standard noun phrase consisting of an article and a noun.
• the rules – A simple plural noun phrase.
• in the – A prepositional sequence, not a lexical word pair.
So the correct answer is (c)