The correct answer is: D. No correction required.
The sentence “He plans to hurriedly complete this work” is grammatically correct. The word “hurriedly” is an adverb that modifies the verb “complete.” It tells us that the action of completing the work will be done quickly and with urgency.
The other options are incorrect because they do not make sense grammatically. Option A, “to complete hurriedly this work,” is missing a subject. Option B, “to complete this work hurriedly,” is missing a preposition. Option C, “to complete this work in a hurry,” is grammatically correct, but it is not as concise as the original sentence.
Therefore, the correct answer is: D. No correction required.