Read the passage below carefully:
In the arid stretches of the Senegal River Valley, rural farming cooperatives have adopted multi-strata agroforestry systems to counteract severe soil salinization caused by prolonged irrigation. By strategically intercropping deep-rooted native species such as the baobab and acacia alongside staple grain crops, farmers have managed to lower groundwater tables and draw toxic salts away from the topsoil. Initial resistance from farmers accustomed to monoculture gave way as harvest yields stabilized over three consecutive seasons. Beyond soil remediation, these indigenous trees generate vital secondary income streams through the harvesting of gum arabic and nutrient-dense baobab fruit pulp. Local environmental agency reports demonstrate a thirty percent reduction in land abandonment across participating communities. Consequently, regional agricultural policy is increasingly shifting from capital-intensive chemical desalination projects toward supporting self-sustaining, community-managed agroforestry models across West Africa's drylands.
Which of the following best expresses the main idea of the passage?
- Community-managed agroforestry using native trees offers an effective, ecologically sustainable, and economically viable solution to soil salinization in the Senegal River Valley.Answer
- BThe harvesting of gum arabic and baobab fruit pulp provides essential secondary income streams for rural farmers in West Africa.
- CCapital-intensive chemical desalination projects have successfully eliminated land abandonment across participating Senegalese communities.
- DMonoculture farming will soon be banned across West African drylands due to its devastating impact on groundwater tables.