Option A is incorrect: The passage talks about the significance of food from non-agricultural lands such as forests, peatlands, etc., in terms of ensuring food security during food shortages and production gaps and complementing the agricultural system. But it does not recommend replacing other trees with food-yielding trees.

Option B is incorrect: Although the passage highlights the resilience of forest foods through the lines “Since the productivity of trees is often more resilient to adverse weather conditions.....forest food provides safety net… ”, it does not mention that conventional agriculture on its own can not ensure food safety.

Option C is incorrect: The line “It allows rural and tribal communities to sustain themselves for the whole year and steer clear of natural disasters and season-induced shortfalls of agriculture food” indicates the vulnerability of the rural and tribal communities. However, the passage nowhere mentions the conversion of wastelands and degraded areas to develop forests and help the poor.

Option D is correct: The tribal and rural communities are vulnerable to food shortages due to crop failures and during seasonal production gaps as seen in the line “..forest food provides a safety net during periods of food shortages caused by crop failures; forest foods also make important contributions during seasonal crop production gaps.” The development of agroecosystems along with conventional agriculture would reduce the vulnerability of these communities and ensure their food security.