Carbon dioxide is one of the gases that is responsible for bringing about the green house effect. It helps in the easy penetration of solar energy into earth’s atmosphere. However, it absorbs heat from the sunlight and keeps the earth warm. As a result of green house effect, earth’s temperature keeps on becoming warmer day by day. Therefore, option (a) is incorrect and option (b) is correct.
Oxygen is a gas that helps in the process of respiration in plants and animals. This gas helps in the metabolism of various macromolecules in the body. It does not account for green house effect. Therefore, option (c) is incorrect.
Water is the universal solvent and is a very necessary component for the existence of life on earth. Ocean water currents help to regulate ocean temperature but do not account for greenhouse effect. Therefore, option (d) is incorrect.
Therefore, the greenhouse effect causes an increase in (b) temperature.