Correct Option (D)
The passage explicitly details several consequences stemming from a decline in forest cover. All four statements provided in the options are directly supported by the text.
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1. Loss of topsoil: The passage states that deforestation leads to "adverse alterations in the hydrology and related soil and nutrient losses" and that consequences "arise out of site degradation through erosive losses." Erosion is the primary mechanism for topsoil loss.
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2. Loss of smaller rivers: The text directly attributes "drying up of the underground springs and smaller rivers in the Himalayan region" to "drastic changes in the forest cover."
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3. Adverse effect on agricultural production: The passage mentions "salinization of land as in the semi-arid and arid 'green revolution' areas" and "decline in food, fodder and fuelwood yields" as ultimate consequences of site desertification, which is linked to deforestation. A decline in food yields directly impacts agricultural production adversely.
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4. Declining of groundwater: The passage refers to "drying up of the underground springs" due to changes in forest cover. Underground springs are manifestations of groundwater discharge, and their drying indicates a decline in groundwater levels or availability.
Incorrect Options:
Since all four statements are identified as consequences of declining forest cover based on the passage, any option excluding one or more of these statements would be incorrect.