The correct answer is B) FOD screens. FOD (Foreign Object Damage) screens are designed to prevent objects smaller than 1/4 inch from entering the GE LM2500 gas turbine engine. These screens act as a physical barrier to block any small debris or particles that could potentially cause damage to the sensitive components inside the engine. The other options are not the correct answer. Inlet louvers (A) are not specifically designed to filter out small objects, the centerbody (C) is an internal component of the engine, and demister pads (D) are used for moisture separation, not foreign object prevention.