Final answer:
The student is asking about replacing gear lubricant in a differential. The correct answer is option C.
Step-by-step explanation:
The subject of the question is automotive maintenance. In this case, the task is to replace the gear lubricant in a differential. The options given are related to the procedure of replacing the gear lubricant.
The correct answer is C) fill the differential until the new fluid is 1 inch Below the fill hole. This option is incorrect because the differential should be filled until the new fluid reaches the fill hole. Filling it 1 inch below the fill hole would lead to an insufficient lubricant level.
The other options are correct. It is important to properly dispose of the old gear lubricant using a licensed recycler (option A), drain the old gear lubricant into a pan (option B), and use new gear lubricant as recommended by the OEM (option D).