A pressure-temperature defrost control is activated by the ____.
A. difference of the pressure in the fan compartment and the temperature of the coil
B. difference in pressure between the outdoor pressure and the fan discharge pressure
C. difference in the pressure of the air through the outdoor coil
D. difference in pressure of the refrigerant in the condenser and the pressure in the coil
Answer: C
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Fill in the blank(s) with the appropriate word(s).