Relative humidity is maximized when the air temperature (T) and the dew point (DP) are closest. In which of the following conditions would the relative humidity be highest?

A
Air Temperature 10°C, Dew Point 12°C
B
Air Temperature 25°C, Dew Point 5°C
C
Air Temperature 15°C, Dew Point 5°C
D
Air Temperature 10°C, Dew Point 8°C
E
Air Temperature 30°C, Dew Point 20°C