Water balance is maintained by
water cycle
Correct answer explanation
(b) The three states of water can be converted from one form to another through different processes, such as freezing, melting, evaporation, and condensation. When this conversion takes place in nature, it is called the water cycle. The water balance is maintained in nature by the water cycle.
Incorrect answer explanation
(a) Rain is primary source of water and balance is maintained by the water cycle.
(c) Oceans are very large. They separate continents and are a source of water.
(d) Seasons are not included in the balance of the water cycle.
Concluding statement
The water balance is maintained in nature by the water cycle, therefore option (b) water cycle is correct.