Explanation:

Many cultures like Celtic, Baltic, Germanian, Slavic polytheism, Indian culture etc. tend to protect the groves of trees on religious grounds. These are called sacred groves. Sacred groves are important as they help in biodiversity conservation, recharging of aquifers and soil conservation. Hence, answer is D.All of the above are correct.
Sacred groves comprise of patches of forests or natural vegetation – from a few trees to forests of several acres – that are usually dedicated to local folk deities or tree spirits (Vanadevatais). These spaces are protected by local communities because of their religious beliefs and traditional rituals that run through several generations.

Ecological Significance
• Conservation of Biodiversity – The sacred groves are important repositories of floral and faunal diversity that have been conserved by local communities in a sustainable manner. They are often the last refuge of endemic species in the geographical region.
• Recharge of aquifers – The groves are often associated with ponds, streams or springs, which help meet the water requirements of the local people. The vegetative cover also helps in the recharging the aquifers.
• Soil conservation - The vegetation cover of the sacred groves improves the soil stability of the area and also prevents soil erosion.