What happens next in this paragraph?

How to use a microwave
Place the microwave on a flat, dry surface.
A clean counter in your kitchen or a solid, wooden table would be good for the microwave. Do not put the microwave near a gas or electric range, such as your stove.
OPT: A. This will cause you to steam the item. Place the microwave on low heat for several minutes.. B. Place a dish on the microwave's' stand'. This will add some cushion to the bottom of the microwave if you spill a cold pot.. C. Make sure the microwave's air vents on one side are not being blocked. Check that the roller ring and glass tray are secure in the microwave.. D. Instead, set it near a tea light in your bathroom or a lamp in your bedroom. Clean the microwave frequently to keep it protected from heat damage..
C.