The correct option is:
- Because warm air can always hold more water vapor than cool air.
Warm air has a higher capacity to hold water vapor compared to cool air. This means that in summer, when temperatures are higher, the air can hold more moisture. If the air is also humid, it may reach a point of higher humidity, making you feel sticky or uncomfortable. In winter, the cooler temperatures typically mean lower humidity levels, and the air does not hold as much moisture, leading to a less sticky feeling.