Why does the water level of lakes change seasonally?

Correct answer: Due to changes in rainfall evaporation and inflow

The direct answer is D: changes in rainfall, evaporation, and inflow. Lake water level is controlled by a water balance. In simple terms, water level rises when inputs such as rainfall, streams, rivers, or groundwater are greater than water losses. It falls when evaporation, seepage, water use, or outflow becomes greater than the input. During rainy periods, rainfall and inflow usually increase, so the level rises. During hot or dry periods, evaporation may increase and inflow may decrease, so the level falls. Option A, changing mountain age, is wrong because mountains do not regularly change age in a way that controls seasonal lake levels. Option B, changing Sun size, is wrong because the Sun’s size does not seasonally change in this manner; sunlight may affect evaporation, but the option itself is false. Option C, changing sea colour, is irrelevant and does not determine the lake’s water balance. Option D is correct because it names the actual hydrological factors. Memory cue: lake level equals water coming in minus water going out.