What happens next in this paragraph?

How to replace a vehicle's o2 sensor
Locate the original sensor which is before the catalytic converter (the square or oval box between the engine and the muffler).
Spray penetrating oil on the old sensor.
Let it sit for a minute.
Select from the following.
(A). To apply oil, put a soft cloth or glove over the sensor, and apply pressure using your elbow and thumb. Make sure not to apply oil to your skin, or your sensor will not work properly..
(B). It will also wet the bleeder pad if your current model will need it later. It is best if the actual sensor is new..
(C). Remove the sensor with the sensor socket. Apply anti-seize compound to the threads of the sensor..
(D). Gently press and slide the partially-stopped sensor down by about a quarter-inch (2 cm). Using a hose, spray penetrating oil on all the parts of the sensor..
(C).