The correct answer is option 4: 1 only.

Option 1 states that anticyclones are low-pressure systems. However, this is incorrect. Anticyclones are actually high-pressure systems, characterized by descending air that creates a region of high atmospheric pressure at the surface.

Option 2 correctly states that anticyclones are characterized by divergent wind circulation. In an anticyclone, winds flow in a clockwise direction in the Northern Hemisphere and counterclockwise in the Southern Hemisphere, spreading outwards from the center of high pressure.

Option 3 states that anticyclones are indicative of dry weather conditions. This statement is generally true. Anticyclones are often associated with clear skies and stable weather conditions due to the sinking air and lack of precipitation. However, it`s important to note that anticyclones can also bring about other weather conditions, such as fog and cold temperatures.

In summary, the correct statement characterizing anticyclones is that they are high-pressure systems with divergent wind circulation.