In a gasoline engine, the area in the cylinder head where the air-and-fuel mixture is burned is called the
a. intake valve.
b. combustion chamber.
c. piston.
d. cylinder.

Combustion chamber. 
Gasoline engine is an internal combustion engine that gives or produces power by utilizing the burning of volatile liquid fuel. These fuels include gasoline or gasoline-ethanol mixture fuel. Ignition usually starts with an electric spark. The combustion chamber houses the burning of the fuel and the air mixture.