Final answer:
At a temperature of 20°C (68°F), a refrigerant container cannot be filled with liquid beyond a maximum of 80% of the internal volume.
So the correct answer is Option C) 80%
Step-by-step explanation:
The question refers to the fill limit for a refrigerant container at a specific temperature. In refrigeration systems, it is common practice to limit the fill level of the container to allow for thermal expansion of the refrigerant.
At 20°C, the recommended maximum fill level is typically around 80% of the internal volume. This precaution ensures that there is adequate space for the refrigerant to expand and contract with changes in temperature, preventing overfilling issues that could lead to system malfunctions or damage.
The correct answer is Option C) 80%