The three causes for water temperature variation in ocean water from your options are depth, latitude, and seasons.
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Depth: As depth increases in the ocean, temperatures generally decrease. Surface waters are warmed by the sun, but deeper waters receive less sunlight, leading to cooler temperatures.
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Latitude: Water temperature varies with latitude due to the angle of sunlight and the distance from the equator. Regions near the equator receive more direct sunlight, resulting in warmer temperatures, while polar regions receive less sunlight and are colder.
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Seasons: Seasonal changes also affect ocean temperatures, as different times of the year can change how much solar energy reaches the surface waters, impacting warmth in specific regions.
The other options (humidity, air pressure, and winds; pressure, gravity, and tectonic movement) do not directly explain the variation in ocean water temperature.