To reduce water usage, Karen should consider the following options from your list:
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Run his dishwasher only when it has a full load of dishes - Dishwashers use a significant amount of water, and running it only when it's full can save a lot of water compared to running it for smaller loads.
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Replace conventional soap with biodegradable soap - While this option is more about environmental impact than directly reducing water usage, choosing biodegradable soap can be part of a broader effort to be more environmentally conscious and responsible with water.
The other options:
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Take baths instead of showers - Generally, showers use less water than baths, especially if the shower is short. So, this option would not help reduce water usage.
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Use sprinklers to water his vegetable garden - This could lead to higher water usage, depending on the sprinkler system. Drip irrigation or hand watering is usually more water-efficient for gardens.
Therefore, the best action for reducing water usage would be to run the dishwasher only when full.