Explanation:

Altitude:
- Atmospheric pressure decreases with an increase in altitude. This is because as altitude increases, the overlying column of air decreases, leading to lower pressure. For example, at higher altitudes like mountain tops, atmospheric pressure is lower compared to sea level.

Temperature:
- Temperature also affects atmospheric pressure. Warmer air is less dense and exerts lower pressure compared to colder air. As a result, areas with higher temperatures tend to have lower atmospheric pressure.

Weather condition:
- Weather conditions such as high or low pressure systems can also influence atmospheric pressure. For instance, areas of low pressure typically experience unsettled weather with cloudiness and precipitation, while high-pressure systems are associated with clear skies and stable weather.

None of these:
- Atmospheric pressure does not vary based on factors like altitude, temperature, or weather conditions alone. It is a combination of various factors that contribute to the overall pressure exerted by the atmosphere at a given location.

In conclusion, atmospheric pressure is influenced by a combination of factors, and understanding these relationships can help in predicting weather patterns and studying atmospheric phenomena.