Forest influence climate, water cycle, and air quality.

Forests remove carbon from the atmosphere by absorbing carbon dioxide for photosynthesis and storing it as food source. Forests transpire a lot of water vapour in the atmosphere thereby cooling the nearby areas. These water vapour eventually take part in the water cycle to fall back on Earth in the form of rainfall. It also is a natural rainfall absorber hence soak up excess rainfall to prevent floods and erosion. All of these prove that forest influence the climate of a particular region.

Hence, option A is correct.