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In this question, we need to determine if there is any error in any underlined part of the sentence provided. The sentence is as follows: "Work hard lest you do not fail."
Option 1 (A): The underlined part "Work hard" is grammatically correct and does not contain any error.
Option 2 (B): The underlined part "lest you do not" contains a grammatical error. The correct phrase should be "lest you should not" or simply "lest you not."
Option 3 (C): The underlined part "fail" is grammatically correct and does not contain any error.
Option 4 (D): The underlined part "No error" implies that there are no errors in the sentence. This option suggests that the sentence is correct as it is.
The correct answer is option 4 (D) because there are no errors in any of the underlined parts of the sentence. The sentence is grammatically correct and does not need any corrections or changes.