Final answer:
The dependent variable in the measurement of water temperature at different depths in Lake Skywalker is the temperature of the water.
Step-by-step explanation:
In the context of the students measuring the temperature of the water at different depths in Lake Skywalker, the dependent variable is what is being measured or what is expected to change as a result of the manipulations of the independent variable. In this case, the dependent variable would be the B) Temperature of the water, as this is what changes with respect to the depth, which is the independent variable. The depth of the lake is what is manipulated to see its effect on the temperature, and thus, is not the dependent variable. The time of day and color of the lake water are not mentioned as factors being measured in relation to the temperature, so they are not considered the dependent variable in this context.