Given below are a few sentences in which four words are

Solution

A to D: Substituting "inhabited" with "cultivating" shifts the focus from the population residing in a certain area to the activities they engage in. "Cultivating" emphasizes the primary livelihood pursuit of the tribals, which is agriculture. This change offers a clearer understanding of their way of life. B to C: Replacing "villages" with "Lands" provides a broader context for the locations where the tribals are engaged in cultivating small portions. "Lands" encompasses not only village areas but also the surrounding territories where agricultural activities take place. This change offers a more comprehensive description of the geographical scope. With these changes, the sentence reads: "Tribals who have been cultivating (A) small portions of land (B) for a sustainable living in some of the non-Scheduled Tribe villages (C) and hamlets, predominantly inhabited (D) by PVTGs are now a threatened lot."