Write the next sentence in the following story.

How to change your mercruiser engine oil
Read your owners manual and its safety precautions.
In general, you need to change your oil every year or every 100 hours of use, whichever comes first.
Visually inspect your engine and check the oil before starting.

Pick your answer from:
A). Inspect it in a light to make sure no oil leaks out of your oil-compartment. If it does, remove it from your engine and run a wire through it to check for leaks.
B). Make sure the prop has been removed and that no people or pets are near the stern drive or prop before starting the motor. Check for fuel or fuel vapors outside or in a well ventilated area to prevent carbon monoxide poisoning to people.
C). If you see green or blue spots or flashing, it means that the oil is too low. If the oil is very low, pour the oil (preferably whole oil) and spray again until your oil goes below the red mark.
D). Remove oil filters and replace them with new ones. The new filters should be on the non-oil surface.. The answer should be
B).