Can Past Strokes Be Detected A Customer Brings A Lawn Mower Into Your Shop For Repairs?

A customer brings a lawn mower into your shop for repairs? - can past strokes be detected

A customer brings his mower repair. The mower is a four-stroke engine 4.0 HP Kohler. The customer complained that the engine is very difficult to start and run just after startup. You begin your examination of the engine by the spark plug to check his condition. It should be noted that the electrodes of the spark plug was covered with dry, soft deposits and black area of the candle filled by these deposits. In addition, the smell of gasoline found at the edge of the leaf. Which of the following statements is the most likely cause of the spark plug?
A. Not piston rings true in the vicinity of the cylinder and the oil seeps from the segments into the combustion chamber.
B. The carburetor is to do too much fuel in the bottle.
C. The fuel and oil mixture that is used in the engine, contains too much oil.
D. The engine operated at high speeds without oil