Final answer:
The dew point spread refers to the range of temperature at which water vapor in the atmosphere may begin to condense. The correct answer is A. 2 degrees.
Step-by-step explanation:
The temperature/dew point spread at which water vapor in the atmosphere may begin to condense is called the dew point spread. It refers to the range of temperature within which condensation can occur. The correct answer to your question is A. 2 degrees. When the temperature and dew point are within 2 degrees of each other, the air is near saturation and condensation is likely to occur.