One must (1)/keep up (2)/his promise (3)/ No error (4)
Explanation:
- Statement 1: "One must" is correct. It sets the context of a general rule.
- Statement 2: "keep up" is correct. It indicates the action of fulfilling or maintaining.
- Statement 3: "his promise" is incorrect. The subject "One" should be followed by "their promise" for gender neutrality and subject-verb agreement.
- Statement 4: "No error" is incorrect, as previously identified.
- Option 1: Incorrect. It corresponds to Statement 1.
- Option 2: Incorrect. It refers to Statement 2.
- Option 3: Correct. It indicates the error in Statement 3.
- Option 4: Incorrect. Suggests no error, but there is an error.
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