The correct answer is: D. diligent
Diligent means hardworking and conscientious. It is the quality of being careful and persistent in doing something.
Energetic means full of energy and enthusiasm. It is the quality of being active and lively.
Prompt means quick to act or respond. It is the quality of being punctual and efficient.
Excellent means very good or outstanding. It is the quality of being of the highest quality or standard.
In the sentence “Everybody likes him because he is an industrious student,” the word “industrious” means hardworking and conscientious. This is because the sentence is saying that everyone likes the student because he is always working hard and doing his best. The other options do not fit as well in the sentence. For example, the sentence would not make sense if it said “Everybody likes him because he is an energetic student.” This is because being energetic is not the same as being hardworking and conscientious.