Correct Answer - Option 1 : knows what really happened
The correct answer is 'knows what really happened' i.e. the error lies in this part of the sentence.
- The error lies in the incorrect usage of the verb 'knows'.
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'Knows' needs to be replaced with 'know'.
- The subject of the sentence i.e. 'they' is plural and therefore, will require a plural verb i.e. 'know', according to subject-verb agreement.
- Thus, the correct answer is option 1.
Therefore, the correct answer is: 'How amused everyone would be if they know what really happened.'
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Subject-verb agreement: It states that if the subject is singular then the verb will be singular and if the subject is plural then the verb will also be plural.
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Example:
- He is going to Mumbai.
- They are going to Mumbai.
