Technician a Says That Whether Combustion Gases Are Leaking into the Engine

Technician A says that whether combustion gases are leaking into the engine can be detected by measuring whether fuel hydrocarbons are present in the coolant. Technician B says that excessive gas pressure in the cooling system can indicate a head gasket leak. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B